Guys any advice on why my puyter has decided to stop workin. It was fine last night but when powering up this mornin it decided to holt on post screen. i have an asrock 4core dual vista board with q6600 8800gts grx 2x1g 667 mem and 550 corsair power supply. Only rebuilt it yesterday and was fine. can't even get into the bios and have reset the cmos but all with no joy. any advice would be great.