Powerbook G4 won't wake up!

[jwayand]

Hello all,

 My Powerbook won't wake up. I can't shut it off either. I tried holding down 
the power button. I tried hitting the Brightness key. I tried all of the reset 
key combinations I know.

I was playing a game called GL Open, or something like that. It's the light 
cycle game... looks like Tron. That program was running and then I walked away 
from the computer. It went to sleep and doesn't want to wake up now. Help!!

Thanks,

Joe W.