If your iPhone won't turn on, most of the time a simple restart will get it back up and running. If you can't restart your iPhone, then make sure it's charged. You might need to replace the Lightning cable and make sure the power source is working properly.
If Android is completely frozen, your device may be powered on and running — but the screen won't turn on because the operating system is frozen and not responding to button presses. You'll need to perform a “hard reset,” also known as a “power cycle,” to fix these types of freezes.
If your Galaxy S7 won't turn on even after a force restart, try charging it. If your phone still doesn't respond, leave it plugged in for 10 minutes, then try to force restart it again.
Press and hold both the top button and the volume down button until you see the Apple logo. If your iPod touch doesn't turn on, follow these steps to check your hardware and charge your device. You might need to charge for up to an hour. If your iPod touch still doesn't turn on, contact Apple Support.
If your Mac still isn't turning on, please contact Apple Support.
If you are unable to update your Mac even after you clean up the storage, restart your Mac. A normal restart often fixes random issues. So, give it a try. Once your Mac has rebooted, head to the System Preferences > Software Update and try to install the update.
The first thing to do when your Apple Watch won't turn on is perform a hard reset. Simultaneously press and hold the Digital Crown and the Side button for about 10-15 seconds. When the Apple logo appears on your Apple Watch, release both buttons. Your Apple Watch will turn back on shortly after.
Try letting it cool down. Then try turning it on in several hours. Remove the battery and check to see if it is deformed this can cause it to fail. if it is the battery replace and then evaluate from there.
Try Settings > General > Shut Down. Or press and hold the side button and either volume button until the power off slider appears. Thanks. That worked.
It's not possible to “overcharge” your MacBook battery by leaving it plugged in. If you leave it plugged in all of the time, the battery won't overheat or damage any other components.
How to fix a MacBook won't turn on issue
Here's what to do if your Mac won't turn on:
MacBook won't turn on? Here's how to fix it