A few times in the past week I have come down in the morning to find my MP in what appears to be an unresponsive sleep. The light on the power button slowly cycles between on and off however the system is unresponsive to keyboard or mouse. I have to push and hold the power button which turns the machine off and then turn it back on. In power settings its set to never go to sleep. The system is connected to an APC UPS which according to the icon at the top of the screen is functioning. The system is up to date running 10.8.2 any ideas as to what might be going on? When I power the machine on after finding it like this it does not say that it recovered from a crash or anything like that. The system has 5 standard 3.5" hard drives as well as an SSD and a bluray drive. It has an AMD5770 driving three 23" LCD's.