Serious problem after 8.1 update from windows 8. My Dell notebook won't sleep when idled or lid closed, nor will it shutdown. The screen turns black, and the LED blacklight and fan are still on and cannot revert to normal mode unless I do a hard reset.
Updated to latest drivers and windows update, to no avail. Checked sleep and power options, and they're still the same as before. Please help! Neither Dell nor Microsoft tech support were able to figure this out, and will call back later.