restart button does nothing

This is a problem that has constantly poping up since i got my new computer, thing is out of nowhere my pc decides to give up, videos stop dead on their tracks, i cant write anything, programs dont load, on the task manager all the processes appear to be at 0%, my only option is to restart, but...

So, this started happening about a week ago. The game I was playing doesn't matter but after like 2-3 hours of gameplay, I heard a loud buzzing sound in my headphones and my computer had frozen entirely, after five seconds the computer restarted itself. I want to tell y'all that I've changed my...

I came back to my PC after locking it and logged back in and was reading DIscord when the display just cut out randomly. I tried plugging in another monitor, still no display, so I press the restart button and nothing happened. I pressed it several times actually and still nothing. So I held...