Last week I was using my PC as normal when it just shut down and restarted itself, so i tried rebooting and it said there was a problem with booting up, so i put a startup disk in and had a look on drive c and it was empty, apart from the default files on it. i thought i had lost everything but then i rebooted and it loaded up normally, so i backed everything up but it did it again, and it got worse cos the hard drive wouldnt even boot up and the monitor wouldnt work. we eventuallu diagnosed it as a problem with the motherboard (no viruses on the HD) .I got a new motherboard last week and formatted my PC and everything seemed fine, until 20 mins ago when i was playing champ mananager and the Pc rebooted and came up with the message "BOOT FAILURE, PLEASE INSERT A BOOT DISK" what the hecks going on? is it the hard drive? luckily i kept rebooting and it eventually let me log onto windows again, but i dont know when its going to happen again. please help!!