Macbook pro only boot with R key

I have a problem with a macbook pro .
I have snow leopard and after running onyx my computer only boot with the R key pressed , I have tried option-command-PR , reset SMC , repair permissions without success .
I have an external apple led cinema but with or without the error continues .
Any help would be appreciated.
Thanks

Why did you try booting with the R key pressed? From what I recall that key simply resets the screen settings, and shouldn't have anything to do with your system starting or not. I would remove it from the external display until we can get this resolved.
I'm wondering if it has something to do with your NVRAM. Try booting with this key sequence cmd-opt-n-v.

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