Macbook pro running OS 10.6.2

I was browsing the internet and the screen froze. All that was happening was the rainbow spiral. I did a hard shut down.

Powered back up. For the past 25 minutes all the computer is showing is a clockwise black spiral on the first screen before the blue screen.

I also did a PRAM and NVRAM reset (command-option-P-R).

What can I do next?