How to fix Samsung Galaxy S9 that blacked out and won’t turn back on (easy steps)

Some of the owners of the Samsung Galaxy S9 have been complaining about the problem wherein their phones blacked out and would no longer turn back on when the power key is pressed and held. Such could be a problem with the hardware or it could be just a minor issue with the firmware. The thing is, we don’t know for sure if we were to base our judgment on the symptoms.

You need to troubleshoot your phone to be able to determine what the problem is and how to deal with it. That’s the very purpose of this post. I will walk you through in troubleshooting your Galaxy S9 so that we would know why the screen blacks out and no longer responds after that. Knowing the problem is key to solving it so if you’re one of the owners of this device and are currently bugged by a similar issue, continue reading as this post may help you somehow.

Before we move on to our troubleshooting, if you are looking for a solution to a different issue, make sure you drop by our troubleshooting page as we’ve already addressed some of the most common problems reported by our readers. Find issues that are similar with yours and use the solutions we suggested. If you still need our help after that, then feel free to contact us by filling up our Android issues questionnaire.

How to troubleshoot Galaxy S9 that blacked out and won’t turn on


When the phone blacks out or turns off by itself and would no longer turn back on, it would leave an impression that there’s a problem with the hardware. That could actually be the case depending on how the problem started. If the phone was dropped and has some signs of physical damage, then some components may have come off inside. Or, if it has been left submerged in water for a very long time, then liquid may have messed up the circuits inside. However, if the device doesn’t have any signs of physical and/or liquid damage, then it must be just a minor issue with the firmware and here’s what you need to do about it:

First solution: Perform Forced Reboot

More often than not, if a phone turns off and no longer turns on, it’s a problem with the firmware and that might be the case with your Galaxy S9 Plus. I understand that it may no longer respond when you press the power key or any buttons but you can still consider it a minor problem and doing the forced reboot may fix it.

Press and hold the volume down button and power key at the same time for 10 seconds or more. This is more than enough to fix the problem ub tif the device doesn’t respond to this, try doing it a couple of more time and if it still not, then try this.

  1. Press and hold the volume down button first and don’t release it yet.
  2. Now press and hold the power key while holding down the volume down button.
  3. Keep both keys held for 10 seconds or more.

It’s basically the same as the first procedure only that we’re making sure this time that the volume down button is pressed before the power key because doing otherwise won’t give you the same result.

Second solution: Charge you S9 Plus and do the Forced Reboot

Having a phone with a drained battery is not a problem at all. In fact, you can just connect the charger to replenish the battery. But the thing about letting the phone run out of juice is that there are times when some services and hardware components won’t be shut down properly. And as a result, the firmware crashes just before the battery is depleted. When it happens, you’re already dealing with a couple of issues–well, minor issues–that both result in a device that won’t respond. Here’s how you can deal with it:

  1. Plug the charger to a working AC outlet.
  2. Using the original cable, connect your phone to its charger.
  3. Regardless whether the phone shows it’s charging or not, leave it connected to its charger for at least 10 minutes.
  4. Now, press and hold the volume down button first and don’t release it yet.
  5. Now press and hold the power key while holding down the volume down button.
  6. Keep both keys held for 10 seconds or more while it’s connected to its charger.

If the problem is the same as what we mentioned earlier, then your phone should already be starting up now. However, if the device is still not responding after this, then it’s time you brought it back to the store and have it checked by a technician or negotiate a replacement.

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