If its shutting off, it sounds like a heat issue. Open the case and blow out the dust bunnies especially around the cpu fan.
okay i didnt think of that lol im gona do it now
Yeah, sounds like a bad motherboard.
The usb ports are probably ran from the southbridge that the hot heatsink is on.
My bet would be yes. How old is the system?
The first link doesn't work for me.
As far as I can tell those parts are good.