24" iMac USB issue

Question

Recently my 4-yr-old 24" iMac has been having USB issues. The only peripherals it will see are the mouse and keyboard (and a printer if it is plugged into the keyboard). Nothing else plugged into the USB ports is recognized - no iPhone, no printer, no hub, nothing. The built-in iSight camera and Bluetooth have also disappeared, and I know they are USB related as well. Genius bar says $450 for new logicboard. I can't find my AHT disk
The USB ports all seem to work with the mouse and keyboard. Any other suggestions? (I have reset PMU.)

Answer 1

Try resetting the SMC, if it doesn't work the first time do it 2-3x. Also try doing a PRAM reset.
_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.
Roger