Not really sure, but it's a good theory. It may not have been turned on in a couple of days before this morning.
Try not leaving anything plugged in to the USB ports while it's turned off for a while. I had a problem for a while of a usb extender causing the cmos battery to drain if the computer was turned off for too long.
@Sumo started
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Not really sure, but it's a good theory. It may not have been turned on in a couple of days before this morning.