I just replaced my venerable Dell 8400 (I know, I know, but it was a workhorse) with a new tower. I was planning to give it to a friend. I air dusted it, but then when I plugged it back in it won't start up. I have a blinking green and amber light (which usually indicates a PSU problem), but it worked 10 minutes before I cleaned it. Figuring I knocked something loose I checked all connections, still nothing.
Well, not totally nothing. It constantly whirls up and then dies immediately, like it a car with a bad starter that can't catch. The PSU fan and all other case fans spin up for half a second, then die. Spin up, then die, spin up, then die, and on and on. The mother board light is solid green. I detached the power from everything and connected things one at a time trying to pinpoint something but no luck.
It's a Dell 8400, 3.8Ghz. Been running an upgraded PC Power & Cooling PSU (Silencer 470 Dell) since 2006 with no problems. Powering an 8800GTS 640MB, sound card and two SATA drives.
What's my next step? Thanks for the help!