A couple of months ago I built a new PC which apart from glitches working with Vista x64 has been a very well behaved machine. Recently I had a couple of lock ups (don't know the cause) and I also once when booting I got a coloured pattern on the screen before bios (so I reset it that time). It behaved afterwards. Most recently I left it on overnight downloading off iTunes and it locked up. After resetting it it booted up fine. Switching it on a week later it now does the following:
- Power light switches on and Ethernet LED flashes (normal)
- Fans switch on (normal)
- Fans stay on for a few seconds
- Fans reset themselves
- This loops around
The fans normally come on initially, switch off/quieten and then it boots into BIOS. However in this case it seems the system resets itself instead of getting to BIOS (or even GFX Card BIOS)
I now have set up a barebones system outside of the case to identify the culprit. This is:
- CPU + Cooler
I anticipated a number of beeps as there is no memory plugged in, however when testing this, I got the same pattern of behaviour as before. I have tried resetting CMOS using the jumper and removing the CMOS battery for a few minutes then switching on.
My gut feeling is the mobo as if it was the PSU then this problem most likely would be intermittent and from what I have read CPU's are pretty reliable under most circumstances.
Is there something straight forward and obvious I am missing and does anyone have any suggestions as to what this might be?
Thanks for any advice :)