kbmho810

What's make your laptop? Did you connect  to TV before?May be try your Fn+? key  toggles between the built-in the display, an external display and simultaneous display on both.

kbmho810

Do you know which two keys on the keyboard the tech pressed to get your monitor all clear again?If you don't know the two keys may be try the fllowing method frist:Unplug the power, remove the battery and then hold the power button for 30 to 60 seconds. Then reattach the power and attempt a boot!