Press the Power Button
Press the power button and hold it down for several seconds. The power button is usually on the right side of the device. After a few seconds, a menu should appear with the Power Off option. The latest Android version might offer other options, including Restart, which is a better option.
Do a Hard Reboot
Even when the Android operating system can’t display the power down menu, you can perform a hard reboot, also known as a hard restart; this is different from a reset or manufacturer’s reset. Not every Android device is programmed to do a hard reboot the same way. Many devices reboot when you hold down the power button. However, it may take 10 to 20 seconds before the system reboots. If the operating system doesn’t respond, try holding down both the power and volume up buttons for up to 20 seconds. After that, the screen will go black, signaling that the device has powered down.
Remove the Battery
If you have a battery in your Android, try removing it to reboot. This method works only if you have a removable battery, but it can be a great backup if you’ve exhausted all other options.
Try Closing Apps Instead
You don’t always need to reboot to solve problems. If your device is running slowly, closing a few apps might speed it up. That’s because, when you leave an app, Android keeps it available so that you can quickly switch back to it. In the meantime, the app continues to consume memory. Swipe up to show recently used apps, and then swipe up on each app to close it.
Close Recently Used Apps
Some Android devices have a Recently Used Apps button in the lower-left corner of the device. To close apps in this view, tap the X on each app or tap Close All.
Task Manager
If these options don’t work, try long-pressing (or double-tapping) the Home button to bring up a menu with several options, including one for the Task Manager. In the Task Manager, you can choose to close or exit apps. On some phones, the Task Manager is a Pie Chart icon.
