How to troubleshoot a Samsung Galaxy S8 that has a black screen and won’t turn on

We’ve already addressed a lot of issues wherein the phones have black screen and won’t respond when the Power key is pressed or held. Based on our experience, this kind of problem can be a minor app- or firmware-related problem or it could be a serious issue with the hardware especially if the device got dropped on a hard pavement or dipped in water. But the point is, we won’t know for sure what the real problem is if we don’t try to even find out.

So, in this article, I will walk you through in troubleshooting your Samsung Galaxy S8 that has a black screen, not responding and won’t turn on. We will try to eliminate every possibility by doing some troubleshooting procedures without compromising your files and data. After we’ve ruled out the possibility that the problem is either app-related or firmware issue, that’s the time you have to bring the phone to a tech and have him fix the problem for you. So, continue reading so that you would know what to do about this.

But before anything else, if you’re currently experiencing different issues with your phone, then I suggest you visit our Samsung Galaxy S8 troubleshooting page for we’ve already started providing support to our readers who own this device. We understand your phone is still brand new and it should work perfectly without a hitch but not even Samsung can guarantee there won’t be any problems. What we do here is provide help to our readers the best we can so if we haven’t published posts about your concern, feel free to contact us by filling up our Android issues questionnaire.

Galaxy S8 screen went black and won’t respond

Problem: I have a Galaxy S8 and my screen went black overnight. Not sure how it happened, but it won’t turn on. I press the power key and the down volume key together, still not working. Whatever I try to do nothing works! Please help me figure out how to get my screen back on. I haven’t had this phone for two months yet. Thanks!

Solution: If you are certain that your phone had not been dropped or has liquid damage, then, it is evident that a performance-related issue might caused it. As a matter of fact, there are number of possibilities to consider that could trigger that the device is unable to turn on or became unresponsive. So, what we’re going to do now is to figure it out what the problem is by performing the basic troubleshooting procedures.

Step 1: Charge the device for 10 to 15 minutes

As you’ve mentioned that you performed those combination keys but your phone is still unable to power on and unresponsive, this time, all you need to do is to charge the device for several minutes to eliminate the suspicion that it is the battery that is causing the issue. Occasionally, due to drained battery the inside components could not be powered up and that would be the reason that the device refused to turn on. What we have to do now is to let it connect to the charger for 10 to 15 minutes to make sure there’s enough energy the device can use when you have to turn it on.

Remember that you are not only charging the battery but also figuring it out if the current is flowing through the circuits of the device because if it does not have hardware issues, then, it would respond when connected to the charger or the LED above the screen will light up. If it lights up, we would like you to do those combination of keys you did on your phone while it is connected to the charger. But after you do so, and the issue is still happening, there is a chance that a system glitch triggered it and you can proceed to the next step.

Step 2: Try to boot your phone in safe mode

In this procedure, we have to determine if the device would be able to boot up normally in this environment. In safe mode, all downloaded applications will be disabled temporarily. So, if it boots up successfully, then evidently, one or some of the third-party apps caused it and you need to find out which of them is the culprit.

Follow these steps to boot your phone up in safe mode…

  1. Turn the device off.
  2. Press and hold the Power key past the model name screen.
  3. When “SAMSUNG” appears on the screen, release the Power key.
  4. Immediately after releasing the Power key, press and hold the Volume down key.
  5. Continue to hold the Volume down key until the device finishes restarting.
  6. Safe mode will display in the bottom left corner of the screen.
  7. Release the Volume down key when you see Safe Mode.

If you’ve successfully made your phone to boot up in this mode, then it’s clear that there’s an app that prevented it from turning on. You need to find that app and uninstall it and here’s how you get rid of suspected app from your S8.

  1. From the Home screen, swipe up on an empty spot to open the Apps tray.
  2. Tap Settings > Apps.
  3. Tap the desired application in the default list or tap 3 dots icon > Show system apps to display pre-installed apps.
  4. Tap the desired application.
  5. Tap Uninstall.
  6. Tap Uninstall again to confirm.

However, if your phone refused to boot up in safe mode or if uninstalling some apps didn’t help fix the problem, then you should move on to the next step.

Step 3: Try booting your phone up in Recovery Mode

Assuming your phone couldn’t boot up in Safe mode, you should try booting it up in Recovery mode since it’s the fail-safe of Android devices. Even if your phone is suffering from a serious firmware issue, it might still be able to boot up in Android system recovery wherein you can do a couple of things that might just fix the problem for you.

You can try to wipe the cache partition of your phone so that all system caches will be deleted and replaced. It’s as effective as the reset but you won’t lose any of your data or files that’s why it’s the first thing you need to do should your phone boot up successfully in this mode and this is how you do it:

  1. Turn off the device.
  2. Press and hold the Volume Up key and the Bixby key, then press and hold the Power key.
  3. When the Android logo displays, release all keys (‘Installing system update’ will show for about 30 – 60 seconds before showing the Android system recovery menu options).
  4. Press the Volume down key several times to highlight “wipe cache partition.”
  5. Press the Power key to select.
  6. Press the Volume down key to highlight “yes” and press the Power key to select.
  7. When the wipe cache partition is complete, “Reboot system now” is highlighted.
  8. Press the Power key to restart the device.

If wiping the cache partition didn’t help, then you should proceed with the reset, which will delete all your files and data. It’s up to you if you want to proceed but it seems like you have no other choice now except bring the problem to a shop. But just so you know, technicians will often try to reset any phone to also protect the privacy of their clients. Here’s how you reset your phone from the Recovery mode…

  1. Press and hold the Volume Up key and the Bixby key, then press and hold the Power key.
  2. When the green Android logo displays, release all keys (‘Installing system update’ will show for about 30 – 60 seconds before showing the Android system recovery menu options).
  3. Press the Volume down key several times to highlight “wipe data / factory reset.
  4. Press Power button to select.
  5. Press the Volume down key until ‘Yes — delete all user data’ is highlighted.
  6. Press Power button to select and start the master reset.
  7. When the master reset is complete, “Reboot system now” is highlighted.
  8. Press the Power key to restart the device.

If the problem still persists after this, then you bring your phone to a shop or back to the store. Please explain to the tech what you’ve tried doing so far and what might have caused the problem so that it would be a lot clearer and easier for the tech to determine the cause. This would also lessen your waiting time.

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