I put the computer to sleep, when I try to wake it clicking the mouse a relay clicks from the back of the computer where the power supply is, but the hard drive doesn't spin up, I put my hand on the drive. I tried booting from my backup drive with the same results. I press and hold the front power button, it turns off, then press the power button a couple times and the computer reboots and comes awake from sleep. The computer runs normally otherwise. I have performed the SMC/P-RAM more than once. I removed all outboard devices including my two backup drives with the same results. Because the HD doesn't spin up after attempting to wake it, I'm wondering if it has to do with that relay back in the power supply. Any hints as to what is causing this anomaly? Am I looking in the right place, the power supply?