Can you try pulling the battery, pull the AC and hold the power button for 15 seconds or so and then reconnecting things? It'll only waste a few minutes. Good luck. Sorry, I missed that it was a...

Unplug the USB cable from your UPS if you have one and reboot. I fought this for days and I think the UPS battery makes the desktop think it's a lappy, don't know but do know it worked for me. I"d...