I'm thinking about not running this PC at all until I find a better PSU tbh. The one I have now worked for ages on another PC, but I really don't want to use it if it can break my PC (especially if it can kill me and my family). I just wanted to check if it's really the PSU that caused this problem or something else. Could it be because of the faulty PSU that I had to change AGP aperture size, or it's not related to it?
By the way, I must say I am incredibly surprised by just how lively this old PC is even after all these years. It was given to me by my uncle as a present for my communion and I had it since. This means then that this PC is literally 14 years old if not more. Of course it has its problems now (bad PSU, CD-ROM doesn't want to open unless there's a CD inside) but it's quite amazing how long it worked anyway. My next PC had hardware problems practically already when I received it. They don't do PCs like that these days.
I guess once I'm done with this PC I will try to resurrect another one that I have lying in the attic. I think hardware should be used from time to time otherwise it dies pretty quick.