USB not detected

I recently brought a mac mini. First thing i did was update all the software, most importantly OSX to 10.5.1. I inserted a usb jump drive to transfer some file then properly ejected it. Now none of the usb ports work. I tried different devices; mouse, keyboard, external hard drive,... Tried rebooting. Nothing worked.
Then i tried resetting the PRAM (CMDOPT+PR). It detected my external drive. But after I eject it, the usb ports stop working. Is it a hardware or software issue? It only happen with the usb ports, my firewire works fine. PLEASE HELP
Message was edited by: PTran

Welcome to Apple Discussions!
...but I didn't think they would fail so quickly, and with so little attached to them!!!
The load created by a WD Passport drive I've used in my office has been sufficient to cause a number of IBM and Dell laptops to suffer failed USB connectivity, so I would not be surprised to see the same sort of issue with a Mac mini. Indeed, the documentation supplied with the drive warned that is should be used with its own power supply (sold separately of course) whenever possible.
The mini conforms to USB standards, including voltage and current available on the bus to power external devices. However, not all devices conform to the standard in terms of load they exert.
Have you tried the SMC reset procedure as described below? If not, then I would suggest you try it. If it does not help resolve this, contact Apple regarding the USB outage since it is clearly within warranty!
a major design fault!
Based on the number of reports of USB failures, it would seem not to be.
To reset the SMC on an Intel mini:
-From the Apple menu, choose Shut Down (or if the computer is not responding, hold the power button until it turns off).
-Unplug all cables from the computer, including the power cord and any display cables.
-Wait at least 15 seconds.
-Plug the power cord back in, making sure the power button is not being pressed at the time.
-Then reconnect your keyboard and mouse to the computer.
-Press the power button on the back to start up your computer.

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