I shut it down last night and now it doesn't boot up. The hard drives spin up, the DVD drive light blinks a little, but the POWER light on the case doesn't turn on. Well, technically the POWER light turned on for a few seconds, but then it shut off again and never came on again no matter how many times I rebooted. It reminds me of what it did for a while after I put a new Athlon CPU in it and the heatsink tilted off the CPU die (thus allowing the CPU to overheat and shut down). I've since fixed that problem with a shim that supports the heatsink properly, though. I'd like to think it's the power supply, because those are a dime a dozen. My luck it's the whole mainboard tho. Ideas anyone?