Sorry, I can't check the motherboard itself, as my dad just came over and took it away for a look. He's more patient than I am and also was an electronics engineer for all his life (and a total tech head). I can honestly say I hate PCs, well working on them anyway. Nothing is ever quite as easy as it appears and they're so bloody fiddly to boot.
My Dad called me earlier this evening and said he's checked everything and can't see any problems. All connections are correct etc, He's going to strip it down in the AM when light is best and double check.