Computer at work started shutting down at windows loading screen a couple of days ago. It boots up to a loading screen an half vey just shuts down. After a about ten tries it boots fine (or if I wait 10-15 minutes in Bios or something), but the next day ordeal continues. Then yesterday it started, also, to shut down whenever we plug anything in any USB port. Printer(well only when we turn the printer on), USB flash, smartcard reader... There is no dump files, no events nothing to indicate nature of problem. Safe mode works, but also shuts down on use of USB.
So far I tried replacing the PSU with another and changing memory modules (got a new one, changed slots...) but problem persists. Checked HDD, all fine. Cleared CMOS.. CPU fan works and temperatures are about 20... Also booting from USB flash works but I am trying to avoid reinstall. Firstly I am not sure it would help, and secondly it's a computer we use for accounting with a lot of data and software that predates my employment there and reinstalling and restoring data from backups would take weeks.
Since computer is old (don't know how old, but it's DDR2 and AM2 so 7 or more years I presume) is it possible that motherboard is done(no bloated condensers as far as I can see) ? Viruses (Avast says no)? Some driver problem (although nothing new was installed as far as I'm aware)? Corrupted system files? Gremlins?!
OS: Windows XP Professional Sp. 3
MB: Biostar NF61S Micro AM2 SE
RAM: 512 mb DDR2@533
CPU: AMD Sempron 3200+
HDD: WD 80gb