10.5.4 installed, Macbook Pro doesn't start up

Hi,
I just installed 10.5.4 via Software Update. But now my Macbook Pro doesn't startup correctly anymore. I hear the start up sound then the white screen with apple and the spinning wheel. Then then fans start to grow louder and louder until the whole unit just shuts down and is off.
Has anyone already experienced this problem? Please help.
Thanks.
Best Rob

The combo update is only available from the Apple download site. The link is in one of the other 10.5.4 threads. Software update only uses a delta update.
Try booting in the safe mode, hold down the Shift key while booting. If you get to the login screen, don't login but hit the restart button. That should allow a normal boot - it forces a disk repair.
Otherwise, boot into the Leopard DVD, select the Utilities menu and run the disk utility from there and repair HD and permission. If that succeeds, you should be able to boot normally.
The update may have actually succeeded but the cleanup failed.
If you manage to get back into your system, check the version of your OS. It may be 10.5.4
If all else fails, you will need to restore your previous system using TimeMachine, although usually one of the above techniques will usually result in a bootable system without needing major surgery.

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