MBP 13 + 10.6.2 - forbidden sign + no longer boots

Hi,
After updating to 10.6.2 my MBP 13 no longer boots it hangs in the startup gray screen with a forbidden sign instead of the Apple logo and the spinner spinning forever...
Any ideas ?
Jorge.

Attempting a boot with cmd-v shows:
Lots of:
Can't load kext com.apple.blahblahblah
Kext blahblahblah not found
Failed to load kext blahblahblah (error 0xdc00800e)
Can't load kext blahblahblah - failed to resolve library dependencies.
(same messages repeted many times, for different kexts)
Couldn't alloc class this
Couldn't alloc class that
Still waiting for root device
Still waiting for root device
Still waiting for root device
Still waiting for root device
Still waiting for root device
Still waiting for root device
Jorge.

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