RE: Black screen background and no access to start menu
If the problem only occurred once and powering down the notebook by holding down the power button resolved the issue I wouldn't worry about it. If the problem continues jot down in your notes what the system was doing just prior to losing the display. How often the problem occurs and if at anytime powering down like before didn't help and shoot me a message and i may be able to help.
Specialize in Laptops, Mobile Devices