hi all, yes it was a really stupid childish error, i had taken side panel off (which contains a fan) for a clean up of pc, did job rebooted pc but forgot to connect fan,so went to connect it and pc just shutdown and wont restart, so i think i touched connectors and blew something. any help appreciated. ok mods you can remove this post, found problem was my surge protector tower, plugged into diff socket and everything ok