Display does not turn on even though computer is running

Hello All,
I have a 2008 non-unibody MacBook Pro. When I boot the computer, sometimes the display does not turn on. I've tried using the flashlight technique, and there isn't even anything on the LCD. I know the computer is on because it makes the chime and if I enter my password I can adjust the volume and play music. Occasionally, resetting the SMC will fix the issue temporarily, but it doesn't always work. What should I do?

Tried  resetting PRAM?
Some  of the display settings are stored in PRAM.
Reset PRAM:   http://support.apple.com/kb/PH14222
Best.

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