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How to fix Samsung Galaxy S7 black screen of death with blue light flashing [Troubleshooting Guide]

Hey guys! In this post, I will address the black screen of death with the #Samsung Galaxy S7 (#GalaxyS7) as we’ve received several messages that basically contain the same complaint. Majority of them reported that their devices turned off and won’t turn back on while others said theirs have a black screen but with blinking blue lights.

Galaxy-S7-black-screen-of-death

The most common reason why the screen turns black and the phone won’t respond is a system crash. When the firmware hangs or freezes, the phone will be left unresponsive and all other services may also crash. That’s the reason why the screen turns off and won’t turn back on no matter.

Read on to learn more about this issue and how to deal with it. For average users, we don’t usually suggest complicated procedures that are potentially harmful to your device. So, if you are comfortable tinkering your device, then try the ones I suggested below.

For our readers who have other concerns, visit our Galaxy S7 troubleshooting page for we have already answered a lot of problems with this phone since its release. Find problems that are similar or related to yours and use the solutions we provided. If they don’t work or if you need further assistance, then you can always contact us by filling up our Android issues questionnaire.

Galaxy S7 screen is black but with blue lights blinking

Problem: For some reason, my new Galaxy S7 turned off, or so it seems, and won’t turn back on. However, there’s this blue light that keeps blinking as if it’s telling me that there are some unread notifications or messages. When I hit the Power key, nothing happens, it just won’t respond or turn on. Help me because the phone is barely a month old and it’s a hassle bringing to the store to have it fixed. Besides, I have sensitive work-related data in my phone that I haven’t backed up yet. I don’t want to lose them nor let somebody see them. Your help will greatly be appreciated. Thank you!

Troubleshooting: The fact that you can see a blue light blinking is evident that the phone’s hardware is fine and more often than not, black screen issues accompanied by lights or sounds are often the result of a system crash. I think that’s what’s happening to your phone.

Before I give the solution, let me explain briefly why I think it’s just a system crash. When it happens, everything in your phone stops responding and the display turns black. The Power key won’t bring the phone back to life. Charging won’t do any good either. There are cases wherein you can actually make a call to your phone number and you can hear it ringing on the other phone but your device still won’t respond.

The solution is to perform the forced reboot procedure, which is the equivalent of battery pull for devices that have removable batteries. All you have to do is press the Volume Down button and the Power key for 10 seconds. Provided there’s enough battery left to power up its components, the phone should start, otherwise, plug the charger in and leave the phone charging for 10 minutes and then try again.

The forced reboot procedure will fix the problem, however, we don’t know what caused the system to crash. So, closely observe your phone and if the same problem happens again, I suggest you backup your data and do the master reset to bring the phone back to its default settings. Here’s how…

  1. Backup your data.
  2. Remove your Google account.
  3. Disengage screen lock.
  4. Turn off your Samsung Galaxy S7.
  5. Press and then hold the Home and Volume UP keys, then press and hold the Power key. NOTE: It doesn’t matter how long you press and hold the Home and Volume Up keys, it won’t affect the phone but by the time you press and hold the Power key, that’s when the phone starts to respond.
  6. When the Samsung Galaxy S7 shows on the screen, release the Power key but continue holding the Home and Volume Up keys.
  7. When the Android logo shows, you may release both keys and leave the phone be for about 30 to 60 seconds. NOTE: The “Installing system update” message may show on the screen for several seconds before displaying the Android system recovery menu. This is just the first phase of the entire process.
  8. Using the Volume Down key, navigate through the options and highlight ‘wipe data / factory reset.’
  9. Once highlighted, you may press the Power key to select it.
  10. Now highlight the option ‘Yes — delete all user data’ using the Volume Down key and press the Power button to select it.
  11. Wait until your phone is finished doing the Master Reset. Once completed, highlight ‘Reboot system now’ and press the Power key. The phone will now reboot longer than usual.

Galaxy S7 display is totally black, phone won’t turn on after update

Problem: There was an update that I downloaded yesterday and I think it went through without any problems at all. The phone rebooted after the update and I was able to use it for a few hours and then it just turned off. When I pressed the Power key, the screen seemed to light up a bit and turned off again. Since then, the device isn’t turning on. I have yet to let a technician check it out but if you how to troubleshoot it, that would be great.

Troubleshooting: Just like what I suggested in the first issue, this might be another variation of a system crash. I’ve seen a lot of issues like this in the past and still seeing some not only with Galaxy devices but with other brands including iPhones. Therefore, the first thing I want you to do is press the Volume Down key and Power button for 10 seconds, if the device’s screen remains black, then here are some things you can do:

Step 1: Charge the phone

Obviously, it will rule out the possibility of a drained battery and since you didn’t mention trying to charge your phone in your description, I thought that maybe you haven’t tried it yet. Of course, use the original charger and cable of your phone so as not to complicate things. If the phone is still not responding when plugged in, leave it for 10 minutes and then do the forced reboot (Volume Down and Power keys) but this time with the device plugged in.

In case the phone refuses to charge, then we are dealing with a phone that has a drained battery and won’t charge. It’s imperative you solve the not charging issue first before you proceed with other troubleshooting. Here are some guides we’ve written about charging issues with the Galaxy S7:

In case your phone still won’t charge, then don’t waste any more time. Send the phone in for checkup and/or repair.

Step 2: Try booting the phone in safe mode and recovery mode

Assuming your phone charges fine and displays the usual charging signs like the charging icon on the screen and the LED notification at the top of the display but still won’t turn on, then try to boot it up in safe mode first. This will rule out the possibility that one or some of your third-party apps is causing the problem.

  1. Press and hold the Power key.
  2. As soon as you can see the ‘Samsung Galaxy S7’ on the screen, release the Power key and immediately hold the Volume Down key.
  3. Continue holding the Volume Down button until the device finishes rebooting.
  4. You may release it when you can see ‘Safe mode’ in the bottom left corner of the screen.

If the phone still won’t boot up in safe mode, then try booting it in recovery mode:

  1. Press and then hold the Home and Volume UP keys, then press and hold the Power key. NOTE: It doesn’t matter how long you press and hold the Home and Volume Up keys, it won’t affect the phone but by the time you press and hold the Power key, that’s when the phone starts to respond.
  2. When the Samsung Galaxy S7 shows on the screen, release the Power key but continue holding the Home and Volume Up keys.
  3. When the Android logo shows, you may release both keys and leave the phone be for about 30 to 60 seconds. NOTE: The “Installing system update” message may show on the screen for several seconds before displaying the Android system recovery menu. This is just the first phase of the entire process.

Step 3: Send the phone in for repair

After doing all these things and your device is still not responding, then it’s time you sent the phone in for repair. As far as troubleshooting is concerned, you’ve done what you need to do as an average user. There’s a possibility that it’s a hardware problem.

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43 Comments

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  1. yo, I just want to dab right now. Harold you gotta make some dollas and be Samsung MvP or whatever. Chill out yo!

  2. Thank the gods for your response, you have saved my phone from the Titans. May you live a long and plentiful life of prosperity

  3. Thank You Harold!!! It was looking like my edge 7 would overheat before the battery drained. Upon powering back up: white screen looping. Tried holding down volume down key with power on key – made a black screen with blinking blue lights. Only your instructions of holding power key and home keys worked. Meltdown averted. Thanks!

  4. I like how you not only give the steps, but also explain them. You’d make a great college professor. Get a master’s degree in coding and call me.
    Bleach

  5. Hi i have a Galaxy S7 Edge today it was frozen and i force restarted it by holding power button it restarts but necer turned on again. The navigation keys (Back, Recent apps) are on but no response from any key. I tired to try these steps. 🙁
    Pls helpme it is very emergency.
    Thank you for ur great website.

  6. thanks so much. fixed problem in less than a minute. how frustrating but glad i researched it before taking it in . kudos!

  7. I’m posting this in the hope that this might help others who have had the recurring black screen of death with the blue light. This worked for my wifes 7S edge and is the process I went through 4-5 times (trying different things) before it worked. What I’m going to explain is the process I went through to backup and fully restore the phone.

    I’ll start with how the symptoms originally appeared. While using the web browser on the phone, it froze and became completely unresponsive, but the screen still showed the browser. After about 30 or so seconds the screen went black and the blue light (top left of the phone came on). Thinking back now, I think the time it took for the screen to go black is simply just the screen timeout set on the phone – so everything is still on, but the screen display is timed out (and black) and the phone is still running but everything is locked. The phone was completely unresponsive and couldn’t be restarted via any of the restart methods (including soft and hard reboot methods).

    Solution:

    Leave the phone untill the battery drains (the blue light will go out indicating no battery life left). Then plug the phone in. The battery charge indicator may take several seconds to come up. For me, it initially showed just the empty battery symbol without the battery precentage, but after leaving for a while it shows the battery percentage – which indicates it’s charging (you may need to unplug the phone and plug it back in again a couple of times, if the charging doesn’t happen straight away). Leave it only until it reaches about 10% charge and unplug the phone (you may need to discharge the battery again if the phone freezes again during the retore process – which happened to me a few times).

    Then I did a hard reset (as described in this post – home key, plus volume up, plus power key… etc).
    When the Samsung logo appears, release the power key and continue to hold the home and volume keys. Release the keys when the droid with rotating arrows comes up. Then leave the phone until the screen shows a series of phone restore options as a text list. You can scroll this list using the up/down volume keys and you select something from the list using the power on key. Pior to the list appearing, I encountered a screen with a yellow triangular warning sign – but if you leave the phone for a minute or two this will disappear and the list should come up. If not, you may need to let the battery discharge again, and repeat the hard reboot. When the list finally displays, it may also be unresponsive (which happened to me a couple of times), so you may need to go back to discharging the battery again (which is why you shouldn’t go over 10% charge for this process).

    Once I got the phone to boot to a (responsive) restore options list, I initially scrolled down and selected the factory restore option and the phone did a factory restore, and the phone started fine, but froze again after a few hours… after painfully setting up the phone back to how it was before the issue. So I was all the way back to the start of discharging the battery. I went through this process again and again it froze up after a few hours of use. At that point we were suspecting a hardware issue, but I persevered thinking it could also be an OS update issue related to the telco provider. So I swapped out my wifes sim card and put my sim card in (different telco provider), dicharged the phone and got back to the point of the restore options. I then selected the clear cache option – which cleared without issue, and then I did a factory restore. Then during the phone setup I selected manual OS updates only, and did an “update now” while my sim card was still in the phone. Then I put back my wifes sim and rebooted the phone.

    The phone is now back to the state it was before the issue occured, running without issue (for now).

  8. Hello
    awesome txt you have put together.
    i have this samsung 7 edge , and after i had a call and hang up ( using wireless talkset)
    the phone turned black screen with red txt , , something bout an error and cannot load boot handler and such , after a few hours it shut down , i came home put some power to it and black screen turns up again just with orange txt ; Bootloader exeption :
    exeption: do_handler_serror: Serror: 0bf000008 . and then some signs and stuff i cant see cus it is so small.
    now i tried to hold the keys you mentioned nothing happens, what do i do here.
    thanks in front .
    Borg

  9. @ Shortz , March 30, 2017 at 6:23 am
    Hi Shortz, I read and think your answer would be my solution. The only question I have at the moment is: How many hours does it get to drain the battery? I’m waiting 26H, but the blue light continues to blink.

  10. My s7 has black screen and solid blue LED, no buttons respond nothing but the LED is on it won’t charge or connect via PC connection

  11. i reboot my black screen of death holding the power and volume down buttons for like 10 seconds, until the phone vibrates and boots

  12. Thank you so much! My Galaxy S7 was showing the black screen of death with a blue light, and I was worried I lost it or had to take it in to get fixed. Your easy fixes worked and my phone is back to normal!

  13. Hi, I had the same issue with black screen and blue color led diode lighting. Nothing worked hard reset buttons like volume down and power etc = nothing worked

  14. Okay so i am having the same problem. My screen wil not light up at all ive held the power button and the volume keys. Please help ive only had this phone for a couple of weeks,

  15. Hi, I had the same issue with black screen and blue color led diode lighting. Nothing worked hard reset buttons like volume down and power etc = nothing worked.

    1, wait until battery is out of energy – diode will stop lighting
    2, hard reset (for me volume down and power didnt work – froze again)
    so I needed to push volume down and home button and power at the same time
    3, reset and wait ( I needed to wait little bit more than usually)
    Now works – however – really thinking of changing to ios back – as this didnt happend for first time and first android.
    Bye

  16. my samsung galaxy s7 edge freezed while on charge with the red steady on… I 1st unplug and follow the step by holding the volume down key and power key… and the result was Wow! it works for me….. thanks lot man

  17. it’s not working, if i hold down power key and volume down nothing happends, i’ve tried to plug it in the charger too. it first started going on and off, but it crashed at the samsung logo( after the Samsung galaxy s7 edge comes up) it crashed there and kept going on and off and did the same thing. i opend the troubleshooting thing, but it crashed when “installing update, so i did the reebot but then the phone turned black with the blue light. Help??

  18. Does anyone have an issue with the LED notification lights not working. for my Galaxy s7 Edge, I used to have blue blinking for emails, news reports; orange for text; green for messaging, etc. I now have nothing (occasionally a blue light) after the last system update. If you are experiencing this issue, and have found an answer, please post! I’ve checked my notification settings and all are on.

  19. I tried all the tricks held volume down and power button nothing tried holding volume up power and home button nothing

  20. OK, so I posted a couple of days ago that my phone was powering on with a black screen and blue flashing light. I have a temporary fix that seems to work for my phone. I’d be interested to know it works for anyone else. This is only suitable for an S7 / S7 edge, as it requires a process that I call “wet booting”.

    – Once the phone is showing the black screen with the slowly pulsing blue light you just need to leave it overnight until it drains the battery. (This does seem to happen surprisingly quickly so the CPU must be doing something)

    – Once the phone is off and does not power on again, plug it in with the original Samsung fast charger. The phone should now show the empty battery icon with the charging symbol and read 0%. However it is probably not charging at this moment. Give it 30 seconds and if it does not start to charge, unplug the cable for 10 seconds and then plug it in again. The phone should now start to charge normally.

    – Leave the phone to charge until it reaches 100%. Do not unplug it until the LED has turned green. Once the LED is green you can unplug the charging cable and move onto the next step.

    – Now for the “wet booting part”. To get my phone to boot correctly I had to submerge it in cold water as soon as it powered on.

    – Fill a jug or a sink with cold water from the tap. Hold the power button only (no other buttons) until you feel the phone vibrate. Quickly, but gently, place it into the cold water.

    – The phone should now start to run through its boot sequence and not crash on start up. Leave it submerged for at least 2-3 minutes, so that all the background apps have time to start correctly.

    – Take the phone out the water, pat it dry with a towel and then login to the device as normal.

    Now I don’t claim this is a fix that will work for everybody – however I have tested this 3 times now and it is the only way I have been able to get my phone to launch past the. I have tried to fully charge the phone and boot it normally (dry booting), and it just gets me to the black screen of death again. Then I have started again from the beginning.

    This is just a temporary fix. I obviously have a serious problem with my phone that needs repairing, however this does at least mean I can get any data off the internal memory that I intend to keep before sending it back to Samsung to be fixed.

    Would love to hear if it works for anyone else!! If it does I will create a Youtube video.

    I hope this helps!

  21. After six months of superb operation of my SM-G935F I had an annoying restarting issue about a month ago. It seemed to be solved by cache wiping. No problems for the next two weeks. Then I made an update to Android 7. Update went smoothly.
    Today during the Chrome browsing .. bang. Reset. It went into self-reset loop for a couple of times.
    I’ve forced the reset for a couple of times to bring it out of the loop.
    No success. Phone went back into the pocket.
    Now, 6 hours later, I have completely black screen with a blue LED permanently on. No key combination found within 2 hours on the Internet can bring it out of this state. Not this time. And it’s not a weak battery.
    Being an embedded programmer – it is frustrating to be so helpless.
    Does anybody know how to cure such situation? Or is it really likely the hardware fault as suggested?

    I just wanted to let you know..

  22. My s7 edge has been having some serious booting problems but got extremely worse yesterday and now its completely off, only showing some writings on the black screen with the blue constantly on, I’ve tried all your methods and it just won’t turn on. Can someone help pls?

  23. My phone has been having booting problems for a few months but they got really bad and now it is totally crashed. Black screen + blue light pulsing slowly. No button combinations work to reset or power off. Has anyone every got past this or is it off to the repair centre?

  24. my s7 edge has a screen completely black. tried your methods and yet still completely unresposive apart from the blue LED that remains on for a little while then shuts off. It still makes noised as though the phone is working its just nothing I do allows me to see my phones display. HELP PLEASE

  25. I seriously need some help, my phone has a black screen and the blue LED is constantly on and seems to shift between two shades. The phone is unresponsive to any and all methods of fixing it that I have tried, and I’ve been hunting for hours, to no avail. Some people have stated that their phone has some kind of text stuck on the screen, yet I don’t even have that. Please help!

  26. Thanks so much for providing this help!!! I’ve used it twice in the past about 6 months. Appreciate it so very much!!!

  27. Mines has “Samsung written over the screen with constant blue light, it keeps turning on to the “Samsung galaxy S7” screen but no further, goes black and back to that screen again, I have tried resets, what shall I do?

  28. hi I need help and fast as I use my phone for my business I’ve only had my phone for 3 months everything been totally fine Untill we just did the new up date and yesterday my phone was freezing and would keep restarting and then it would take me to the os update.. Now it just black with a blue like on 😯 now I have done all the button pushing everyone say to-do for the black screen of death I’ve tried everything but my phone will just freeze on Samsung bit and then back to the black screen I left my phone over night waiting to see if the little blue light would turn off and it did so I charged it up and was so excited it was going to work but soon as I turn it on back to the black screen really need help I’ve tried all the holding and pushing buttons but dosent work ?? Thanks

  29. I have a problem which appears different to everyone else’s….Samsung S7, solid blue led (not blinking), black screen but with illegible red writing/symbols at the top, nothing else. No combination of button pressing or recharging etc has helped and red writing stays on screen all the time. Any ideas? Thanks.

  30. My S7 has black screen on lock screen for 4-5 times within 15 days of purchase. I visited service center that time they said system crashed then they reset it. yesterday after 3 days same problem with device so they said they will replace the LED.

    I just want to ask you what should i do as it is new phone?

  31. hello, i want to say thank you. after reading your post my phone got fixed. thank you so much and your post is very helpful

  32. Hey
    My S7 Galaxy hangs a black screen yesterday. And a red lamp is lit all the time
    I tried what you wrote here, it does not help. Full battery
    Can someone help me?

  33. Okay, so I dropped my phone and the top left corner of the screen cracked. Now the screen wont turn on, however the blue light is blinking and my alarm even went off this morning. When i press the power button the back button lights up, and the screen flashes for a second but doesn’t show. If anyone could help, i’d appreciate it because i have numerous pictures on my phone near and dear to me that i don’t know if they’re backed up or not.

  34. I think i’ve found the real problem. My phone has this problem from day 1 that i bought the phone and that was from sep 2016. I have tried everything including all this info from the topic and even new sd cards, new firmwares, safe mode etc you name it. But here it comes! It seems related to the battery saving mode where the phone puts apps to sleep after few days of no use. Like every day i get this msg that the phone as put some app to sleep mode and aslong as i swipe that msg away and wont look up what apps he put in sleep mode the phone seems stable. Now when i do look what apps the phone put in sleep mode or i even go look at them manually by going though the menu then the phone has a big change to freeze when i turn the screen into standby and wont wake up.

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