My computer is randomly rebooting. I've tried everything I can think of to diagnose the problem and have so far come up empty. It's a QX6850 on an EVGA 680i-A1 motherboard. The reboot is truly random; it can happen a minute after boot or not for over a day. The frequency of rebooting does seem to be increasing. The problem was occurring with mess frequency under Windows Vista- I am not running Windows 7 Pro. There is no blue screen on reboot, and there are no entries in the Event Viewer. On reboot, USB devices freeze, and are not usable again until there's either a full power cycle or the OS starts again.
Here's what I have tried;
* Ran with no start up programs/minimum drivers
* Checked CPU and VGA temperatures, all are in acceptable ranges
* Ran Memtest+ for five cycles, then tried half memory in/half out just to be absolutely sure
* Removed all unnecessary devices (sound card and front panel USB/1394 connections)
* Replaced the video card
* Replaced the power supply
* Replaced the motherboard
* Updated BIOS
* Underclocked the CPU
* Increased memory voltage .1V
I'm officially flummoxed. Any tips would be greatly appreciated.
Here's what I have tried;
* Ran with no start up programs/minimum drivers
* Checked CPU and VGA temperatures, all are in acceptable ranges
* Ran Memtest+ for five cycles, then tried half memory in/half out just to be absolutely sure
* Removed all unnecessary devices (sound card and front panel USB/1394 connections)
* Replaced the video card
* Replaced the power supply
* Replaced the motherboard
* Updated BIOS
* Underclocked the CPU
* Increased memory voltage .1V
I'm officially flummoxed. Any tips would be greatly appreciated.