Well, you have two recourses I think. You can wipe your entire PRAM and NVRAM by following this step:
http://docs.info.apple.com/article.html?artnum=2238
Or you can jump into Terminal and type
sudo nvram boot-args
If something along the lines of -v is shown, then you can type in
sudo nvram boot-args=""
And that should boot it into normal mode. I'd suggest the apple document, but if you're comfortable in terminal, the other options should work, too.