I’ve recently bought a used computer, and it has a few problems. I’m looking for a guide to help me identify which parts are causing the problem.

I’ve tried to watch and read a few guides on how to build a pc, but they haven’t given me any information on how to identify broken parts.

I’m interesting in a guide, but I’ll also post my specific problems, if any of you know how I might fix them ^^

the problems I’m experiencing are the following:

the screen will sometimes glitch out with black areas when watching movies, but only when in fullscreen. The problem usually disappears for some time when exiting and re-entering fullscreen mode.

The computer won’t run certain drivers and sometimes when powering off, the computer will use a long time closing certain applications, but will fail in the end and I have to power it off manually. Also, it will sometimes reset my settings. Back to factory wallpaper and factory everything. it remembers my users and my applications.

I’ve grouped them into two paragraphs, because I have an idea, that the graphical problem might be caused a bad GPU.

I have no idea, what’s causing the stuff in the second paragraph 😅

also, I hope this is the right community for this question - I couldn’t find any communities specifically for computers.

any help is welcomed ^^