Being somewhat of inexperienced as to what problems a bad PSU can cause I figured I'd ask those that know better: I have a Gigabyte K8N AMD 3400+ 2 GB Crucial DDR400 DVD/CD-RW 7800 WD Hard drive BFG 7800GS 120 mm Zalman CPU fan 2 80mm Case fans I'm running this off a 300W Antec PSU. My problem began with enabling triple buffering on my video card, I began to get random reboots (no BSOD, just a soft boot) while playing EQ. I checked both video card and CPU temps and they were no where near any cause for concern. I decided to test my ram with Memtest86. I set it up to test, left it for the night and came back to find it frozen in the middle of a test. Great, I figured, RAM error. When I tried to reboot I would only get a black screen, the monitor would not even light up like it does when it receives a signal from booting up. Would not boot into BIOS or anything. The fans started up fine, I could hear the hard drive rev up, and the good RAM light came on. I tried with only one of my 3 RAM DIMMS and cycled through them one at a time. I checked for excess dust. I changed out my video card to an ATI one I had laying around. No good I reset my CMOS, no good. On a whim I actually turned off the switch on the back of my PSU. Well now, as you can see because I'm typing, it booted up. I finished all my RAM tests one DIMM at a time with no errors. I have my BFG back in. Would a inadequate or bad PSU cause this?