Issue w/ top USB port on 20" rev.B

I occasionally have the need to use all three ports on the back of the iMac - one for the USB keyboard, HP printer, and USB 2.0 external HDD. Currently (and I'm not sure if this has happened from day 1 or more recently) I cannot use the top USB port. It just won't work. I plugged in my external HDD, and it didn't register. I then unplugged my MS Mouse from the keyboard USB port and tried plugging it in to see if it was my HDD or port. The mouse wasn't recognized and didn't power on (the optical laser stayed off). I then swapped the mouse back, unplugged the printer and plugged the HDD into the second port - worked fine. Any ideas??? Thanks!
-Mike

Call Apple! You are still under your one year hardware warranty.

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