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Samsung Galaxy S7 Edge screen is black with LED blue light turning on during reboot [Troubleshooting Guide]

The black screen of death has a few variations. There is a case wherein the screen simply turns black and unresponsive any time, there is also a case that the screen is blank but there’s blue light flashing but it may also be unresponsive. This is the kind of issue we will be tackling in this post as some of our readers have been complaining about it shortly after their devices got updated to Nougat.

Let’s try to determine what the problem with  your phone is and why the screen turned black and unresponsive. We will try to consider every possibility and rule out each of them until we can arrive at the point where we can easily pinpoint what the problem really is, why it’s happening and what needs to be done to fix it. so , if you own this phone and are currently bugged by a similar issue, then continue reading as this post may be able to help you.

However, if you are trying to find a solution to a different issue, then visit our troubleshooting page for we have already addressed hundreds of problems with this device since it was released. Try to find issues that are similar with yours and use the solutions and troubleshooting guides we suggested. If they don’t work, however, contact us by filling up our Android problems questionnaire. Just give us information and we’ll help you find a solution.

How to troubleshoot Galaxy S7 Edge black screen issue

Problem: My S7 Edge went dark and flashes when I hit the home or power key.  I have done a hard reboot (volume down power) several times, it flickers, reboots with a flickering screen but I can see it reboot, LED blue light goes on during reboot, then goes dark again after reboot.  I connected it to my surface to see if it recognized it, it does but it doesn’t stay, it connects and disconnects over and over and doesn’t stay connected, I can see a driver error message on the connected device icon in the devices on my surface when it connects for about a second.  I don’t know what else to do.  I let my battery run low and it died while I was on a call, then I charged it up to a few % and used it again, then I plugged it in to charge it. Then I moved it to a different outlet and it started doing this. help! Is my phone hosed?

Solution: As you indicated that the phone’s screen went black but the LED still lighting up, there is a chance that this is just a glitch in the system. In fact, this issue is common to all android users wherein the device will immediately become unresponsive without apparent reason. Although we are not really sure what caused the problem, so, what we have to do now is to troubleshoot first the software department to make sure that this it is not a software issue. However, if the battery is faulty and could no longer provide the required power to the device that could be the reason that your device is unable to turn on. If that’s the case, there’s no point to troubleshoot the device, instead, bring it to the nearest shop in your area so that the technician can check and fix it. Here are the methods that you should do:

Step 1: Charge the device for 15-20 minutes

In this type of issue it is imperative to verify the battery condition of your phone by charging it for 15-20 minutes. While in this state observe closely if the device is responding or able to power on, if it is, then the battery might be drained during that time that is why your phone won’t turn on. Also, make sure that the USB cable that you are using is not broken or has any damage because if there is, there is a big chance that the device won’t charge. However, after you checked all of it and charge the device for 15-20 minutes and still not responding, then follow the next method.

Step 2: Try booting up in Safe Mode

This time, we have to verify if one of the apps you downloaded from Play Store is the main factor that your phone refuses to turn on. In this method, only the pre-installed apps are allowed to run in the firmware while the third-party ones will be deactivated temporarily. So, if it boots up while in this mode, obviously, there’s an app responsible for it. But since, we cannot delete all of it simultaneously all you need to do is to start from the recent app you installed on your phone until the issue is resolved. This is how to boot in safe mode:

  1. Press and hold the Power key.
  2. As soon as you can see the ‘Samsung Galaxy S7 Edge’ 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.

Step 3: Try to boot in Recovery Mode and wipe cache partition

The system caches are temporary files stored in the directory to make it easier the device to load-up those files every time your phone will use it. But if those apps are corrupted and caused conflict to the system that would be the reason that your device function abnormally. In this procedure, we will wiped out all those files in the directory so that your phone can create newer and fresher files that could run perfectly in the system. But nothing to worry about this method, because  this won’t delete your important files and settings. This is how to wipe the system cache:

  1. Turn off the phone.
  2. Press and then hold the Home and Volume UP keys, then press and hold the Power key.
  3. When the Samsung Galaxy S7 Edge shows on the screen, release the Power key but continue holding the Home and Volume Up keys.
  4. When the Android logo shows, you may release both keys and leave the phone be for about 30 to 60 seconds.
  5. Using the Volume Down key, navigate through the options and highlight ‘wipe cache partition.’
  6. Once highlighted, you may press the Power key to select it.
  7. Now highlight the option ‘Yes’ using the Volume Down key and press the Power button to select it.
  8. Wait until your phone is finished wiping the cache partition.Once completed, highlight ‘Reboot system now’ and press the Power key.
  9. The phone will now reboot longer than usual.

After you clear the system cache partition and your phone still refuses to turn on, then you don’t have a choice but to do reset.

Step 4: Start in recovery mode and Reset your phone, if possible

As far as troubleshooting is concerned, you already did what you can to fix the issue. But since the problem is still happening, then your last resort is to do the reset on your phone. The system will be back to its factory default all apps you downloaded and files stored on your phone will be wiped out.

  1. Turn off your Samsung Galaxy S7 Edge.
  2. Press and then hold the Home and Volume UP keys, then press and hold the Power key.
  3. When the Samsung Galaxy S7 Edge shows on the screen, release the Power key but continue holding the Home and Volume Up keys.
  4. When the Android logo shows, you may release both keys and leave the phone be for about 30 to 60 seconds.
  5. Using the Volume Down key, navigate through the options and highlight ‘wipe data / factory reset.’
  6. Once highlighted, you may press the Power key to select it.
  7. Now highlight the option ‘Yes — delete all user data’ using the Volume Down key and press the Power button to select it.
  8. Wait until your phone is finished doing the Master Reset. Once completed, highlight ‘Reboot system now’ and press the Power key.
  9. The phone will now reboot longer than usual.

After resetting try to see if the device will power on normally. Because if not, then we can’t do anything about it but to recommend you to bring immediately your phone to the nearest accredited shop in your because there is a chance that it is a hardware problem.

However, if the phone’s screen still remains black after the reset or if your phone cannot successfully boot up in recovery mode, then you need to bring the phone to a shop and let the tech handle the problem for you.

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