So I have a Dell laptop that has been running well for a really long time, and as I was typing, I realized the keys weren't working. So I looked it up, and it told me to reboot my laptop. Well, the power button won't work, and the computer won't turn off, so I pressed shut down in the options. All that did was turn off the screen, but the rest stayed on. I can't turn it off and the keys still won't work, please help!