I am currently having a problem with a computer I built. The computer when you have it in normal startup or selective startup will reboot itself when you are watching videos online. The reboot will happen quicker in IE 8 then Firefox 3.6 but will do it in both. There is no BSoD on reboot. I have deselected the automatic reboot selection in case of a BSoD just in case there is one. In the event viewer it just says the computer rebooted but doesn't have an error saying why it rebooted. I have checked the temps and they are with in spec.
If I go in safe mode it will not reboot itself. This leads me to believe it is a driver/software problem. I have checked the memory with memtest86+ 4.10 and it passes. I have ran sfc and chkdsk and both found no problems. I have downloaded the latest drivers for the motherboard and video card. The computer will not reboot itself if it is left idle. It only reboots when you use the internet or internet video.
Any help would be greatly appreciated,
Intel Core i7 860
Intel DH55TC motherboard
Sapphire Radeon HD4350 1GB video Card
Seagate 1TB hard drive
4GB Kingston DDR3 - Default timings
Windows 7 Home Premium