Macbook Pro doesn't start from internal disk. How to?

Hi.
My Macbook doesn't startup. I tried to repair it but it isn't possible and now I need to do one last backup copy before format it. But it doesn't pass from the grey apple screen.
I've checked the S.M.A.R.T. and it is OK. What else can I do to start from the internal disk on last time?
Thanks.
Best regards,
Telmo

Hi. Yes, I did. It goes on and on with the grey apple screen.
I just need it to boot one last time to save one Word document that I didn't had the chance to backup.
The internal disk appears on the disk utility when I star from the install disk and I select it to boot but when restart nothing happens.

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