after I load Call of Duty and reboot the computer I get sound but the screen is black. I am running a IMAC with parrellels 4.0 the other Call of Duty games run fine. I would like to join the server but with out a picture im lost. has this issue ever happened to anyone else.

thanks

Have you tried Bootcamp instead?

no what is boot camp

It's like Parallels' cooler, more popular brother.  And as far as I know WAW runs fine from within it.

Check your Graphics card o make sure you have "shader" capability under game system requirments.
If not you will have to get a new card.

Go to this website (Can You Run It) to check if your system can run COD WAW or any other game.

http://cyri.systemrequirementslab.com/srtest/