27" I7 iMac will not recognize thumb drive

I have a PNY 8gb Attache thumb drive that is not recognized by my 2010 27" I7 iMac. It does not show on the desktop, disk utility, finder or system profile. However, this thumb drive works on my MacBook, 2006 24" iMac and a Dell laptop running XP. I have 4 other drives (1-4gb) that work on all of our computers. Currently running Lion @ 10.7.3 but this problem existed on SL @ 10.6.8 also. I have tried this drive as a FAT-32 and Mac OS journaled and the 27" still will not recogize the drive. Any thoughts? Thank you.
Forgot to mention - called Applecare but they couldn't help.

Try doing a SMC reset, that might help. Otherwise I'd try another thumb drive.
SMC RESET
Shut down the computer.
Unplug the computer's power cord and all peripherals.
Press and hold the power button for 5 seconds.
Release the power button.
Attach the computers power cable.
Press the power button to turn on the computer.
PRAM RESET
Shut down the computer.
Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.

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