There's been a few odd things since I came home last summer (a cold boot, I'd have to re-seat the video card, but that was about it. Otherwise it seemed to get power and all). The (I think it is the PSU fan has sounded a tad bit off the last coupla weeks however, though it isn't the easiest place to get me ear up to to track exactly where the sound change is comming from. Anyway, today they turned the air conditioner on in my apt complex. Problem is, previously the thermostat didn't change over from heat to A/C due to a bum change over stat that detected whether hot or cold water is in the pipes. Despite this change, it still didn't detect it today, so I just went to change the wires (reverse them on the stat) so the stat would work right for A/C. Not wanting to get jolted when the thing would come back on (it does no doubt carry a fair amount of current) I shut down my computer (typical way in Windows with start, shutdown, and shut down the computer) in winXP Pro. Turned the circuit breaker off so I wouldn't get electrocuted and pulled the stat out of the wall, reversed them (the land lords around here took months to send maitanence when this has happened before...and either roasting or freezing as it turns on the A/C when it's cold and turns it off when it's warm, so it either never runs or runs indefinitely isn't my idea of fun), screwed it back in, and switched the circuit breakers back on. The computer was running just fine prior, as long as I didn't shut down and reboot (above mentioned prob with no video from a cold boot), but this time, unlike before where it would run but without video, it now ran for a split second and shut itself down. The power LED is flashing green, but that's it as the power cuts (fans stop running after that second and everything). I'm inclined to think it's a PSU problem, but am not 100% positive as I can't find any indication on what a flashing power LED means. Another thing that makes me suspect this as a possiblity, I bought the PSU with my current computer case in 1999 or 2000. The PSU is one of the oldest components in my computer at about 5-6 years old now. It's been there through several upgrades, and at this age might be nearing end of life. It's at least conceivable for an over 5 year old piece of hardware... It flashes about once every second. I can find references online to beep codes, but not a flashing power LED code. Is this the PSU, and is this what I should replace? What does a flashing power LED indicate specifically, if not a PSU problem? Is there something else I should check? My funds are limited now, being in college and all, so I can't go around just changing everything, but if it's failed, I need access to my computer again. Any suggestions?