Clicking iMac and Failing USB Ports

Hey. I've had my new iMac G5, 18.ghz for about a month now. I'm new to abll ebut I love it until a few days ago. My iMac every few minutes or so makes a click and then just keeps going. It's a sound from the computer and not the speakers. Also yesterday my lowest USB port at the back of my computer failed and nothhing i plugged into it would work. I ran a hardware test and everything came back saing it was fine. I restarted and all my USB ports were not working! I resttarted again and now everything is fine. Has anyone else had hte same problem?

The keyboard USB port is USB not USB 2 and doesn't have a lot of power. The back ports are USB 2.0 and have more power.
If the USB ports are drawing too much current they will shutdown and there should be a note in the log telling you so.
Open the 'Utilities' folder and then run Console and look at the time it happened and see if its there or not.
If they shut down restarting is probably resetting them.
Well if its the side opposite the CD slot then I'd think hard drive. Run disk utility and see what it says under 'SMART status' It should say 'Verified'
Does it lag when its making the 'Click'? and is it aloud click or more like regular drive activity all of a sudden?
as StevenC said its probably a good idea to back up any data you have.
--Spire

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