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How to fix Samsung Galaxy S8 black screen with blue light blinking issue (easy steps)

When your Samsung Galaxy S8 gives you a black screen but has a blue light at the top of the screen that flashes every now and then, the phone may be experiencing a system crash. It seldom occurs to new phones but as your device becomes older, that’s when performance-related problems start to manifest and firmware crashes are among the most common issues.

Fortunately, it’s a minor problem (most of the time) and it’s very easy to fix. In this post, I will share with you the most effective solution you can use to bring your Galaxy S8 back to life. It’s a very easy procedure, safe for both your data and phone and you don’t actually need someone to do it for you. So, if you’re one of the owners of this device and are currently bugged by a similar problem, continue reading as this article may help you.

Before going further, if you found this post because you were trying to find a solution to your problem, then try to visit our Galaxy S8 troubleshooting page as we’ve already addressed most of the commonly reported issues with the phone. We’ve already provided solutions to some of the problems reported by our readers so try to find issues that are similar with yours and use the solutions we suggested. If they don’t work for you and if you need further assistance, fill up our Android issues questionnaire and hit submit.

Solution for Galaxy S8 with black screen and blue lights flashing

As I said earlier, it’s a pretty minor problem and it’s easy to fix as long as you can do the procedure correctly. More often than not, system crashes may occur due to some issues with apps or some files that the system uses. Such issues can be fixed by removing the battery but that’s only applicable to phones with removable batteries, of course. For the Galaxy S8 with non-removable battery, there’s something you can do that will simulate battery disconnect and here’s how you do it:

  • Press and hold the Volume Down button and the Power key simultaneously for 10 seconds.


Assuming the problem is actually just due to a system crash, this simple procedure is more than enough to bring your phone back to life. However, if it still won’t respond to this procedure, then maybe you’re not doing the combination correctly. So, try doing this…

  1. Press and hold the Volume Down button first and don’t let go.
  2. Press and hold the Power key while holding down the Volume button.
  3. Keep both keys held together for 10 seconds to simulate battery disconnect or Forced Reboot.

Pressing the Volume Down button first has a different effect than pressing the Power key first. The combination of these buttons will simulate battery disconnect but it’s better that you press the Volume Down button before triggering the phone to power up by pressing the Power key. However, if the phone is still not responding after this, then try doing these steps…

  1. Plug the charger to the wall outlet.
  2. Connect your phone to the charger using the original cable.
  3. If your phone shows it’s charging, then it’s good but regardless whether it shows the charging symbol or not, allow it to charge for at least ten minutes.
  4. Now do the Forced Reboot procedure one more time but this time while the phone is connected to its charger.

Provided there’s no issue with the hardware, by now, your phone should already be booting up. If your phone is still not responding after this, then you should try a couple of troubleshooting procedures just to know if the phone is still capable of turning on. Continue reading for a quick troubleshooting guide below.

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How to troubleshoot Galaxy S8 black screen with blue lights issue

There are only a couple of things I want you to do to see if the phone is still capable of turning on its components. Don’t worry, none of the procedures below will mess up your phone even further; they’re safe.

Try running the phone up in safe mode

All third-party apps will be temporarily disabled while in this mode so if one of them is causing the problem, your Galaxy S8 should be able to boot up into this environment without any problems:

  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.

Consider the problem fixed as soon as the device boots up successfully in this mode because it’s a clear sign that the problem is basically due to a third-party app. Find that app and uninstall it to fix the problem.

Try booting the phone up in Recovery mode

Even if your phone has some serious firmware issues for as long as the hardware is fine, it should be able to boot up in Recovery Mode. It’s important that you try doing this because there are a couple of things you can do in this environment that will help you fix any problem with your phone. First would be to wipe the cache partition so that all system caches will be deleted and replaced and the second would be the Master Reset.

Boot in Recovery mode and wipe cache partition

  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 cache partition.”
  4. Press the Power key to select.
  5. Press the Volume down key to highlight “yes” and press the Power key to select.
  6. When the wipe cache partition is complete, “Reboot system now” is highlighted.
  7. Press the Power key to restart the device.

Boot in Recovery mode and do the Master reset

  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 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).
  4. Press the Volume down key several times to highlight “wipe data / factory reset.
  5. Press Power button to select.
  6. Press the Volume down key until ‘Yes — delete all user data’ is highlighted.
  7. Press Power button to select and start the master reset.
  8. When the master reset is complete, “Reboot system now” is highlighted.
  9. Press the Power key to restart the device.

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