Currently Being ModeratedApr 30, 2012 8:33 AM (in response to MThiker)
it's not getting a signal.
About this Mac > ( More Info ) > Graphics and Displays ...
... must list your display, or it cannot automatically set the resolution and draw a picture on it.
If your MacBook uses Mini DisplayPort, the most common issue is that the plug is not completely inserted in the jack. You must push the plug until essentially ALL of the metal part disappears inside the jack.Mac Pro (Early 2009), Mac OS X (10.6.8), & Server, PPC, & AppleTalk Printers