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My computer will not shut down correctly or enter sleep mode. When I do a shutdown, Windows shuts down and I can hear the hard drive spin down, but the fans and lights stay on until I hold down the power button. If I try to put the computer to sleep, the screen goes black, but the fans and lights stay running and I can't wake it up. Does this sound like a motherboard issue? I suspect the board because the primary PCI-E slot stopped working previously, which makes me think the board is going bad. I have tried updating the BIOS to no effect.