Display on laptop not working

having not too many friends that could help me with my problem , i will ask the ones that might help with mine , could anyone tell me why a laptop could start and continue to run but not show a thing,blank from the time i push power to the time i shut down.I tried a different screen ,memory,i also tried to plug in an external monitor.Does anyone know of a short cut to enable the second monitor when my primary one doesnt work?A keyboard shortcut?i have four laptops that do the same thing they boot and run no beeps but no picture? I dont know how to get the external monitor to work after i plug in to the laptop?
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  1. What operating system does it run? I know in Windows 7, (Start + P) will cycles through the different output options.
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