Keyboard is not working after a while

Question

After I've let my Mac sit idle for a while, the keyboard stops responding. I Have to unplug it from the USB and plug it back in to work. This happens a lot. What can I do?

Answer 1

In addition to Barbara's suggestions you could also try plugging another USB keyboard in and see if it repeats. At least you may know if its the port or the keyboard.
If you have other external devices in addition to the keyboard plugged in, try removing them and see if that makes any difference.
If neither of the above work you could also try the following:
PRAM Reset (Random Access Memory)
1) Shut down the computer.
2) Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
3) Turn on the computer.
4) Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
5) Hold the keys down until the computer restarts and you hear the startup sound for the second time.
6) Release the keys.
or a SMC (System Management Controller) reset
1) Shut down the computer.
2) Unplug the computer's power cord.
3) Press and hold the power button for 5 seconds.
4) Release the power button.
5) Attach the computers power cable.
6) Press the power button to turn on the computer.