The fun starts now, after 5 years this computer has stopped working, hah, new parts arrived today :)

Before ordering new parts did you try resetting the CMOS?

@Justananon Yep I did. The computer was delivered from Valencia to Berlin with a company called SEUR. When it arrived it had serious, visible damage. I had an insurance worth 60EUR which they're completely ignoring atm. Never going to go with them again.