What to do If your Samsung Galaxy S21 Turned Off By Itself, Won’t Turn Back On

This post will help you troubleshoot the new Samsung smartphone that shuts down unexpectedly and won’t turn back on again. Here’s what to do if your Galaxy S21 turned off by itself and won’t turn back on again.

What causes the Galaxy S21 to shutdown unexpectedly?

Unexpected shutdowns in mobile devices are often attributed to hardware damage, particularly a defective battery. But there are also some cases where errant apps, corrupted files, software bugs and malware are to blame. It can also occur among other symptoms of performance issues on an Android phone especially when the phone’s memory is running low.

In normal instances, a device may shutdown unexpectedly and refuse to power on simply because the battery is totally drained or empty. In this case, letting the device recharge is all that’s needed to get it back up and running properly again.

But in the case where the phone is sufficiently charged but suddenly turns off and refuses to power on again, then that could denote something is wrong either in the software or hardware aspect.

Troubleshooting Samsung Galaxy S21 Turned Off By Itself and won’t turn back on

Such a problem is common among older devices but may also occur earlier than expected even on high-end models.

Depicted in this guide are some helpful workarounds that will help you troubleshoot a similar issue on the Galaxy S21 smartphone.

You can try any of the outlined procedures to rule out every possible culprit that triggers your Samsung smartphone to shutdown unexpectedly.

1. Charge your phone.

As mentioned earlier, an empty or totally drained battery is usually the main reason as to why a phone dies and is unable to power back on. Thus, charging the phone is the first recommended solution. 

Allow your phone to charge for at least 30 minutes. Just keep it plugged into the charger and wait for it to accumulate sufficient battery life to power up again.

Also ensure that your phone is able to charge. If it doesn’t show any charging indicator, then it’s probably not charging. Should this be the case, you will need to deal with a charging issue and rule out every possible cause beforehand. 

You can start with the charging paraphernalia in use. Be sure to use the Samsung-supplied (OEM) charger for your Samsung Galaxy S21.

Also, check and ensure that there’s no damage on the charging cable, adapter and charging port. You can try plugging the charger into other power sources to determine whether or not the problem is with the power source.

If your phone is able to charge properly, then just give it ample time to recharge. When the charging indicator reaches at least 50 percent, try to power it back on.

2. Force restart your phone while charging.

If your phone doesn’t turn on after letting it charge for 30 minutes, then it’s probably stuck in black screen or BSOD. In this case, performing a forced restart will help.

Performing a forced restart forcibly ends any stuck apps and services that might have prevented the device from working properly until it became totally unresponsive.

It doesn’t affect any saved data on the internal storage so you won’t lose any critical data in the process.

To force restart your Samsung Galaxy S21, just follow these steps:

  • Press and hold the Volume Down button and the Power key for about 8 to 10 seconds. This will end all stuck services and make the phone initiate automatic system reboot.
  • When you see the Samsung logo, release both keys.
  • Wait for your phone to complete the boot sequence and load up the Home/Lock screen.

If the phone managed to boot up and respond properly after a forced restart, eliminate every possible culprit. This is important to prevent the device from shutting down or becoming unresponsive again.

Boot the phone in Safe Mode

A simple way to determine whether or not the unexpected shutdown is triggered by a third-party app is to put your Galaxy S21 in safe mode. 

Safe mode will put your device into a diagnostic state and return to default settings.

All downloaded apps are temporarily disabled while in safe mode, so all that’s left running are built-in or preloaded apps and services. This therefore makes it easier for you to figure out if a third-party app is really to blame.

To put your Galaxy S21 in Safe Mode, just follow these steps:

Press and hold the Power button and Volume down button simultaneously for a few seconds and then release both buttons when the Power Off prompt appears.

  • Touch and hold the Power Off icon and then release when the Safe Mode prompt appears.
  • If prompted, tap Safe mode to confirm. 
  • Your device will then boot into safe mode in about 30 seconds. A Safe mode label will then appear in the lower-left of the Home/Unlock screen.

By then you can start testing the device and app functionality with the Safe Mode enabled.

If the problem doesn’t occur while on Safe Mode, then clearly it’s an indication that any of the third-party apps installed on your phone is the culprit. In this case, you can uninstall suspected apps starting from the most recently added and then see how your phone works.

System Restore via Android Recovery

A drastic solution to deal with flawed software that results in unexpected system shutdown would be a factory reset or master reset. Some critical system files might have been corrupted and therefore need to be restored. If possible, you can do a master reset via Android recovery mode.

Other Helpful Suggestions

Eliminate possible culprits

Among the common factors that often cause a device to get stuck on black screen or shut down unexpectedly include corrupted files and errant applications. So try to think of which files or apps you’ve recently added before the problem instigated. You can delete individual applications or files you suspect.

Check your Phone Accessories

Remove any protective cases or third-party accessories that may interfere with any of the external buttons on the phone. 

Some non-Samsung accessories won’t fit perfectly and thereby result in accidental pressing on the power button.

Check the Power button on  your phone

If you previously dropped your iPhone by accident and later it started to power off unexpectedly, chances are that some physical components including the power button might have obtained some damage from the previous incident. To rule this out, check the Power button for any atypical movement. 

For an undamaged power button, you should hear a slight but distinct clicking when pressing on it. 

If something seems to be odd with the power button or any of the external components on your phone, then you may have to consider having it checked by an authorized technician.

If there was a previous incident of liquid exposure like when your phone got wet, then it’s possible that the battery or any relevant internal component has obtained some sort of liquid damage that results in the power system becoming unstable.

Should this be the case, hardware repair would be necessary.

Hope this helps!

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