Intel Macbook keyboard not working

Today I had a user with a Macbook email me to say the keyboard and mouse weren't working, even after a restart. However, a bluetooth mouse that was attached was working fine. The CAPS lock key was stuck on, but it may have been like that prior to the keyboard becoming unresponsive. I tried restarting again just to see for myself, and it definitely didn't work. So, I did a full shutdown and left it sit for a few minutes, then powered it back on. The keyboard and mouse were fine after that. Since restarting doesn't necessarily cut power to the machine, some component must have needed to actually be shut off in order to reset itself. I know this sounds like common sense, but just in case someone runs across this problem and turns to Google first, try shutting down completely and then turning it back on.