Sometime it's happen when your camera has been in use for long time you don't need to troublshoot anything on your device close your camera. Wait for 30 seconds then after again open your camera by tapping on camera app. At time all you need to restart the camera and the problem will be fix. follow this fix camera not working android phone simple steps and see if this helps you to solve this issue .

So your just go out from your house and try it at any other place may be in your place its not giving good network strength and try to reset your phone it will work after reseted the fon if it will not then take it to the store and gave it to the mobo technician and tell him all the problem and try to install the new operating system.

Might be the place were you put your mouse is not good for moving the mouse properly so try to use your mouse with the mousepad or might be your mouse speed is slow from the mouse setting so just go ahead and speedup all the mouse setting.

First check your power switch from the wall if its working fine the check your power cable which is connecting with your computer then or may be check your power cable port is not working or check your motherboard because some time its happen that your motherboard is not pass through the power to the circuit and remove the RAM from your computer and put it back it'll gonna help you.