Thanks everyone for the advice - had a busy day so not had a chance to have a proper look at the machine, but had a quick play this evening.
The BIOS seems fine, nothing changed in there, still showing correct time and date, etc. It stayed on while I was checking the info in the BIOS incidentally, but as soon as I tried to boot again the machine switched off as soon as it went past grub. Interestingly when I tried to boot from a live CD - which I've tested on another machine - the DVD drive wouldn't read from the CD. I don't think the DVD has been used more than a few times since setting the PC up over a year ago, so I can't be sure that there's nothing wrong with the drive.
Unfortunately the machines shuts off before I can get to a proper command prompt - can get the grub options but nothing past that.
The machine is usually on 24/7 by the way, but not sure I can justify the cost of a UPS. I'll have some time to look at it properly tomorrow, so I'll keep you updated.
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PC shutting down new
PC shutting down new
