Hi basically what happens this computer is when i turn it on, it loads to the windows 7 loading page (when the colours come togeather) and then it just randomly turns off. No hardware or software changes have been made and its not a virus because ive already scanned. so then i launch startup repair and it suggests doing a system restore but i said no and the pc restarted and it works now. This is the 2nd time this has happened. But no doubt this will happen tomorrow. It seems as if there might be dust iin the back of the computer making it overheat? please help! cheers!