Plugging in USB shuts down computer - now it won't start up

I have this USB cable that connects mics and other instruments to the computer. I'd used it before without a problem - but yesterday I plugged it in and the computer immediately shut down. I was clearing some dust out of the port and the computer started up. I guess some sort of short has taken place.
The bigger problem is that the computer will no longer start up all the way. I get the gray screen with the status wheel - but it doesn't get past that. It will stay there for a half hour if you leave it - but it never fully starts up.
I unpluged all peripherals. I tried the CommandOption+RP, but nothing.
Any ideas how I can get my computer back?

Look at these links.
Will it boot in Safe Mode? See
What is Safe Boot, Safe Mode? (Mac OS X)
http://docs.info.apple.com/article.html?artnum=107392
*Resolve startup issues and perform disk maintenance with Disk Utility and fsck*
http://docs.info.apple.com/article.html?artnum=106214
 Cheers, Tom

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