Grey Screen after update - need help

Hi
My friend just called me - her macbook is stuck on the grey screen with apple logo - after she done the security updates and restarted.
She can boot into Windows XP (bootcamp) without any issues.
I'm going over there tomorow to help her out and was wondering if someone could give me a little guidance as to what needs to be done.
I guess I can try booting off of the instalation disc and reparing permissions, but after that I'm pretty much lost. Any help is greatly appreciated
Cheers

Hello,
I've had this problem twice, and each occurred after a security update.
What helped me was the following:
-Take out your powercord and your battery. Press the power button for about 5 seconds.
-Then, insert your battery and powercord, start the computer, and hold down AppleCTRL+PR.
From what I understand, one of these two steps resets the power management system on the macbook.
After you perform these two steps, your computer may still hang at the grey screen with the apple logo. However! Let it hang for about 5-10 minutes and it will automatically restart, and boot properly.
You can also try calling Apple support on your friend's behalf ... they were more than helpful.
Blackbook Core Duo   Mac OS X (10.4.9)  

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