Macbook won't boot to Mac OSX but will boot to Win XP after crash

My Macbook froze this afternoon so I held down the power button for 10 seconds and it went off. I turned it on and I get the gray screen of death (power off and restart, etc.). I did many times and nothing happened. I also, did the PRAM reset and NRAM reset, etc. . . I tried to boot from the install cd and I get the same gray screen after 2 mins or so (pressing command-c).
It will boot fine into Win XP via bootcamp so it appears that the hardware is fine?
Help!

Nope - doesn't work. I even can hold the option key down to see all my boot options - MacOS, WinXP, and Install CD. I select the cd and it runs for 2-3 minutes and then crashes with the same error screen.

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