No Display after wake up after sleep

My son has a MacBook Pro (Late 2007)... never any problems before... never
This morning, he put the computer to sleep by closing the lid. After about an hour, when he opens the lid, the display does not "wake up." The computer is on... white light... everything... no display.
After a restart... still no display... there's the chime... the keyboard lights come on... just no display.
The computer is on... just no display. You can hit the power button once to turn it off, then the return key to select shut down, just like you would if the display is on...
What could cause this issue? Are there any "fixes" short of brining it in for service? Any suggestions would be greatly appreciated.

Try resetting your SMC and PRAM.
Resetting the System Management Controller >>
Dave M.
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No Display after wake up after sleep

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