I have a Mid 2007 iMac, and recently picked up a TrippLite 1000VA UPS, which is connected to one of the USB ports on the back of iMac. I usually leave iMac on, or put it to sleep. Since the UPS, sleep doesn't seem to be the same - iMac now wakes up with a bump of the mouse, rather then a deliberate key stroke to wake it. Anybody else notice similar behavior?