Computer won't boot into OS X.... blank screen

I installed some new RAM recently and had some problems. I needed to reset the nvram after it wouldn't recognize some of the ram, so I pressed Option, Command, O, and F upon rebooting to get into Open Firmware. The computer went to the screen with the circle and the slash through it. I reset by holding the power button. Now it boots to a blank screen.
During all of this I can still hear the startup sound.
One problem with possible solutions is that my bluetooth keyboard is not communicating with my Mac for some reason, so key presses are out of the question.
I tried resetting the PMU by pressing the button inside the computer, but nothing happened.
Any suggestions?

Ok,
After many boot attempts, the computer finally went to the Open Firmware dialog screen.
When I get my hands on a wired keyboard, should I reset nvram using the dialog command? Or should I just tell the computer to boot into OS X? After my first attempt to reset nvram, I'm a little suspicious of the whole process.
Thanks for your help, everyone.

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