Yes, you can try resetting the System Management Controller by doing this which is from Apple's website:
MacBook (13 inch, Late 2008), MacBook Pro (15-inch, Early 2008), and MacBook Pro (17-inch, Early 2008)
If the computer is on, turn it off.
Disconnect the AC adapter and remove the computer's battery.
Press and hold the power button for 5 seconds and then release the button.
Reconnect the battery and AC Adapter.
Press the power button to restart the computer.
This info is further explained here at Apple's site:
On the brightness button in the first answer, also try holding the fn key in the lower left corner when trying to pump up the brightness.
If this doesn't get you going, try these:
1) Restart, as soon as you hear the startup chime hold the Command S keys. You'll get a Unix text screen. When the prompt come up type:
make sure there is a space between k and -. Then hit the return key. When the diagnostics say the computer seems to be ok type:
then hit return and you'll start up back to normal. You won't be able to do this if your screen still doesn't power up of course.
2) Start up in Safe Mode by restarting and as soon as you hear the startup chime, hold the shift key. Keep holding the shift key until you see the Gray Apple and spinning gear. Then let go of the shift key. It may take up to a half hour to start up because the system runs diagnostics and may be repairing. After the computer starts up, restart again without holding any keys.