The motherboard is a Asus M4A87TD Evo AMD 870. I'm currently at work, wife phoned to say there was a power out, and now can't use the linuxmce. I tried logging into it from work, but turns out it hasn't switched itself back on. Will go through the bios when I get home and have a good look. Google searches suggested that I need a UPS, but 99% of results were Windows or Mac based answers, I know that you can get a lot more from your hardware with Linux.
If I have no joy in the bios, I'll keep digging.