here's ths deal. i build computers for fun, and occassionaly for spare money. i recently amassed the components for a desktop system and assembled it, but it will not power on. When i turn the power supply on, it tries to power up (the fans spin, power LED comes on), but only for about 5 seconds or so. changing the adapters that components use to connect to the power supply produces more or less up time (between 3 seconds and about 1.5 minutes), but it always powers down again. It just sort of fades out.
system specs are:
AMD 2500+ Barton
Thermaltake Volcano 9
GeForce FX 5700
WD 80 GB 5400 RPM HD
Generic 52x cd-rw
Superflower SF-609 fan controller/temp monitor
I've tried with the power supply that came with the case, as well as a power supply i KNOW to be good (both 420W) to no avail. i thought it may have been low voltage from the outlet, so i plugged my good machine in and it worked fine.
best guess i have is that the MoBo should be RMA'd.