Why is my Intel iMac restarting randomly and USB keyboard not working randomly?

My intel iMac has been randomly rebooting itself without any error messages.  It also seems to coincide with the keyboard (USB) not working, but not always.  At first, it seemed to happen right after waking the computer from sleep, but now it happens when I am just sitting at the computer about once or twice a day.  For now, i have temporarily removed all external devices (except time capsule) and disabled any bluetooth or iTunes synch'ing over wifi.  I have also disabled all power management features.
I've tried different keyboards and resetting the SMC.  Could bad memory cause this?

Could be anything from a loose power cable, to loose or bad RAM module.
1. Check all your power connections, including the mag connector on the back of the iMac.
2.  Reinstall the RAM modules, as per > iMac: How to remove or install memory. When installing new or reinstalling RAM, be sure to push firmly on each module with both thumbs to insure that they are fully seated in the slots.
Then if it is still acting up...
3. Run the > Extended Apple Hardware Test

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