How to fix Galaxy M40 No Power issue | won’t turn on

No Power issue is one of the most common problems in many smartphones today. In this troubleshooting guide, we’ll show you the solutions that you can do when facing Galaxy M40 No Power issue. If your M40 won’t turn on, this post should help.

Before we proceed, we want to remind you that if you are looking for solutions to your own #Android issue, you can contact us by using the link provided at the bottom of this page. When describing your issue, please be as detailed as possible so we can easily pinpoint a relevant solution. If you can, kindly include the exact error messages you are getting to give us an idea where to start. If you have already tried some troubleshooting steps before emailing us, make sure to mention them so we can skip them in our answers.

How to fix Galaxy M40 No Power issue | won’t turn on

Fixing No Power issue on Galaxy M40 can be simple, depending on its cause. If the reason for the problem is software-related, there’s a chance that you may be able to solve the problem on your own by following this guide. Learn what you can do below.

Galaxy M40 No Power issue fix #1: Check for hardware damage

Whenever you find an Android device failing to turn on back on, the first troubleshooting step that you want to do is to check for bad hardware. If your Galaxy M40 No Power issue started after dropping the device, exposing it to water or liquid, or leaving the device exposed to elements such as too much heat or cold, it’s possible that bad hardware may be to blame. If any of these things happened, the best thing that you can do is to bring the phone to your nearest Samsung Service Center so a technician can examine the hardware.

In some cases, some software troubleshooting may allow the phone to power back on but not permanently fix the damaged hardware. Your hope in this case is to allow the phone to turn on so you can create a backup of your files. But again, there’s no software tweak that can permanently fix a broken hardware. If you want a permanent solution, you’ll want to have the phone repaired.

Galaxy M40 No Power issue fix #2: Charge device

If your Galaxy M40 No Power issue happens all of a sudden and you are positive that it was not dropped, exposed to elements, or suffered any physical damage (because you know the history of your phone), then there must be a software-related reason for it. In that case, we suggest that you continue with the troubleshooting steps to figure out where the problem is coming from.

The next best thing that you can do is to charge the device. Sometimes, a Lithium-based battery may lose enough power so that it becomes unable to power up the system again. To check if that’s the case, all you have to do is to allow the phone to charge for some time. In this guide, we suggest that you let it charge for at least 30 minutes. Make sure that you don’t interrupt the charging session by turning the phone back on. If your device turns on successfully after that, make sure to also recalibrate the Operating System and battery with these steps:

  1. Drain the battery completely. This means using your device until it powers down by its own and the battery level reads 0%.
  2. Charge the phone until it reaches 100%. Be sure to use original charging equipment for your device and let it charge up completely. Do not unplug your device for at least two more hours and also don’t use it while charging.
  3. After the elapsed time, unplug your device.
  4. Restart the device.
  5. Use your phone until it completely runs out of power again.
  6. Repeat steps 1-5.

Galaxy M40 No Power issue fix #3: Use another set of charging accessories

Using another set charging accessories is another great option to try in this case. Like the main phone itself, the charging cable and adapter can go bad. The charging cable may not work properly as expected if the tiny wires inside are broken. This happens if you’re not careful with how you care for the cable. If there’s enough broken wires inside, your device may not charge properly or at all.

Should your Galaxy M40 still won’t turn on at this point, it’s a good idea to check if there’s a problem with the charging cable and adapter. You must do this even if there’s no obvious signs of damage to the USB cable and adapter. Try to borrow an original set of Samsung cable and adapter for the Galaxy M40. If that’s not possible, you can visit your local Samsung store and try their own Galaxy M40cable and adapter.

Galaxy M40 No Power issue fix #4: Check for Black Screen issue

If the phone is not totally dead and still makes sound notifications (for incoming messages, alarms, apps, etc.), it’s possible that the problem is isolated to the screen assembly. This usually happens after the device is dropped or cracked. Basically, what’s happening is that the screen is damaged but the motherboard is still working normally. However, since the screen is the gateway to the system, it needs to be fixed first so you can continue using your device. If the screen won’t come on at all, you’ll need to send the phone in to Samsung so it can be repaired first. If all is well inside, then your phone should work normally after that.

Galaxy M40 No Power issue fix #5: Check the charging port

One other basic thing that you must do if your Galaxy M40 won’t turn on is to visually inspect the charging port. This is the part where it’s most exposed to dirt, lint, debris, or foreign object that users don’t usually mind at all. If there’s something in the port that blocks the charging cable from making contact with the connectors, charging the phone may be slow or not possible at all. If your M40 has depleted the battery and there’s a problem with the charging port, being unable to charge might be the root cause of the problem. If you think that the charging port is dirty, try cleaning it with a can of compressed air. Do not stick anything inside to avoid damaging the system.

If the port is clear and there’s no visible damage to it at all, then you want to go ahead and proceed to the next troubleshooting step

Galaxy M40 No Power issue fix #6: Do soft reset

Should the problem return after rebooting the app itself, the next thing that you want to do is perform a soft reset. This should clear the system and possibly get rid of the bug as well. To do that, simply press and hold the Power and Volume Down buttons for about 10 seconds. Once the phone has restarted, release the buttons. This is usually effective in clearing bugs that developed when a system is left running for some time. We suggest that you restart your M40 using this method at least once a week to lessen the chances of bugs.

For some Galaxy M40, there may be a slightly different way to arrive at the same method. Here’s how:

  1. Press and hold the Power + Volume Down buttons for approximately 10 seconds or until the device power cycles. Allow several seconds for the Maintenance Boot Mode screen to appear.
  2. From the Maintenance Boot Mode screen, select Normal Boot. You can use the volume buttons to cycle through the available options and the lower left button (below the volume buttons) to select. Wait for up to 90 seconds for the reset to complete.

Galaxy M40 No Power issue fix #7: Boot on Safe Mode

Sometimes, a bad third party app may interfere with Android and cause problems. If your Galaxy M40 No Power issue started after installing an app, try to delete it and see if fixes the problem. If you suspect that there’s another app causing the current issue, you can identify by using Safe Mode as help.

Here’s how to do that:

  1. Press and hold the Power button until the Power off window appears then release.
  2. Touch and hold Power off until the Safe mode prompt appears then release.
  3. To confirm, tap Safe mode.
  4. The process may take up to 30 seconds to complete.
  5. Upon reboot, “Safe mode” appears in the lower-left of the home screen.

Remember that third-party applications are disabled in this mode so what you can use are pre-installed apps. If Galaxy M40 No Power issue won’t appear on safe mode, that means that the problem is due to a bad app. Uninstall the app you recently installed and see if that will fix it. If the problem remains, use the process of elimination to identify the rogue app. Here’s how:

  1. Boot to safe mode.
  2. Check for the problem.
  3. Once you’ve confirmed that a third party app is to blame, you can start uninstalling apps individually. We suggest that you begin with the most recent ones you added.
  4. After you uninstall an app, restart the phone to normal mode and check for the problem.
  5. If your M40 is still problematic, repeat steps 1-4.

Galaxy M40 No Power issue fix #8: Boot to other modes

Android is a complicated software environment and may sometimes encounter bugs. Problems may range from minor performance issues to total failure to boot up. In some cases, the system may appear to boot up only to become stuck in Samsung logo screen. At other times, an OS bug may prevent the device from loading the UI at all. If the cause of the problem is an Android OS glitch, you should still be able to restart the device to other software environments like Recovery Mode or Download Mode. These boot modes are independent of Android and are used by Samsung technicians to diagnose software problems. To check if you have an Android issue, consider booting your device to any of them. If your Galaxy M40 boots to Recovery mode, you may be able to fix the problem by wiping the cache partition or doing a factory reset. In Download MOde, the only thing that you can do there is to reflash the software. If you haven’t heard of the term flashing before or if you are not confident to do it yourself, you should seek help from Samsung.

Below are the ways to boot to either Recovery Mode or Download Mode:

How to boot a Galaxy M40 to Recovery Mode

  1. Turn off the device. This is important. If you can’t turn it off, you’ll never be able to boot to Recovery Mode. If you are not able to shut the device off regularly via the Power button, wait until the phone’s battery is drained. Then, charge the phone for 30 minutes before booting to Recovery Mode.
  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).

How to boot a Galaxy M40 to Download Mode

  1. Turn off the device. This is important. If you can’t turn it off, you’ll never be able to boot to Recovery Mode. If you are not able to shut the device off regularly via the Power button, wait until the phone’s battery is drained. Then, charge the phone for 30 minutes before booting to Recovery Mode.
  2. Press and hold the Volume Down key and the Bixby key, then press and hold the Power key.
  3. You’ll know if you’re on Download Mode when you see a screen that says “Downloading….”
  4. Remember, if the screen works in any of these modes, that’s a clear sign that you have an Android OS issue. Be sure to factory reset the device in Recovery Mode to fix it.

Galaxy M40 No Power issue fix #9: Get phone repaired

Should none of the above suggestions work, there might be more serious trouble going on. You’ll need to let a Samsung technician check the device. Go to your nearest Samsung store or Service Center and submit the phone for repair. Or, you can contact Samsung by phone and set up appointment for repair. Depending on your region, repair for this type of issue may be free.


If you are one of the users who encounters a problem with your device, let us know. We offer solutions for Android-related problems for free so if you have an issue with your Android device, simply fill in the short questionnaire in this link and we will try to publish our answers in the next posts. We cannot guarantee a quick response so if your issue is time sensitive, please find another way to resolve your problem.

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