For what ever reason my computer keeps shutting itself off and I have no idea why. It might be the power supply It's a 380W supply and I'm running Windows Vista. I'll post the other specs for it later after I get done with work.
Check your processor, if the heatsink is not properly connected, it will cause the processor to overheat, and shutdown u'r computer.. or you might have installed some software that causes your system to shutdown..hope this help..
I've encountered a problem before, my pc keeps restarting but it works well in safe mode.. i just to uninstall some software and it works fine again..try to uninstall the last software that you load to your pc...it might cause the problem...
At first it sounded like a virus like the Blaster Worm which causes a denial of service and shuts off your computer. But you state it also happens in the safe mode as well so I guess that would be unlikely.
I have the Microflex 66B as well, different power supply.
If you can keep your computer on long enough, I would recommend you download and install Intel Desktop Utilities for your DP965LT motherboard. This will monitor your power supply voltages, computer temperatures and fan speeds and give you an alarm if outside of normal perameters. Also I would install the latest bios for your motherboard, the latest versions provided better fan control for the heat sink fan. Just for grins go ahead and run a virus scan. Lastly I would call Micro Express Tech support. Your computer comes with a 2 year warranty and unlimited phone support.