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  • The mobo can hold some charge in it's capacitors but after that it's on the battery to keep the clock going and the bios chip alive(depends on the mobo a bit but some do that). Did it happen any times when you left the pc off for longer than normal?

  • 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.

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