Last night someone knocked something off my desk. It bumped my desktop and it shut off. I didn't try to turn it back on. This morning, when I hit the power button, nothing happens. All of the cords are still in. Is the PSU dead? I don't have another I can switch out. Anything else I can try?

Does anything else that is plugged in to the power outlet work? How hard did the object hit your desktop? The impact would have to be overly extreme to knock the connector off of the motherboard.

Okay, I replaced the PSU. It powers on, but the second I hit the power switch a really loud BEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEP goes off. ???

Check to make sure your heatsink and ram weren't knocked loose by the bump.

Is it one long beep, or is it one long *repeating* beep?

Google: post error beeps

Okay I will check. But it's one long contious BEeep =(

Fixed it! Turns out it was the PSU... and it just wasn't all plugged in correctly =X

don't play football in your computer room