Okay, I've always been able to do this before. I click on the power button, sat the computer to go on System Standby in a couple of hours, and while I'm away from the computer, it does. However, since today, I woke up in the morning and the computer was still on. I come back from school, and it is still on. What kind of problem could this be? And yes, I'm sure that I set it to go on Standby.