Severe USB problem

I have a iMac 24 inch Aluminum (early model) with 2.8 GHz, 4 GB of Memory (upgraded from 2GB by myself) and have had the latest updates with everything... well cept the iMac EFI 1.3 update thats not working for me, but thats another story.

Anyways, I went to go on my iMac today, booted it up, and for some random reason my wired keyboard and wired mighty mouse stopped working, so I restarted and restarted my iMac over and over, then I went and grabbed another USB keyboard that I owned and tried it, it didn't work. Then I noticed that none of my usb devices worked with my iMac, like my iPhone connector didnt even charge my iPhone.

Anyone knows whats going on?

oh btw: I screenshared back to my iMac with my macbook air and checked my system profiler, it says "No information found" under USB, like I don't have any usb's on my iMac.

Also booted up windows and there arent any usb devices either.