I put the MP to sleep then the next day I find it completely shut down! I boot it up and then I hear it beeping rhythmically (every second) lasting for about 2-3 minutes. Any idea what caused MP to shut down on its own? And what does the beeping mean? The beeping is coming from inside the MP's speakers, not from my BOSE 5 computer speakers. There might have been a power outage, but I have a UPS.