Hey.
I was visiting my relatives today and they told me to take a look at their really old Hewlett Packard PC which has Windows 98 since something was wrong with it.
So I booted it and it instantly started doing long beeps continously, the windows loading screen came up and it loaded for a while (still beeping). After that screen went black for about 15secs and it started to load windows again, but this time the beeps changed to short beeps that kept repeating. It got stuck in an endless loop loading windows over and over again but never got past it and the beeping never stopped.
Didn't have time to check out BIOS yet but gonna check that tomorrow.
Bad PSU or some RAM problem maybe?
edit: it also did show artifacts on the screen before and after windows loading screen