IMac 24" Intel Core 2 black display on boot after update to 10.6.7

Help!
After updating software to 10.6.7, my iMac won't display anything but a black screen after booting, the system seems to be working because you can figure out that the list of users is there to start up (keyboard & sounds) but no display. Things I have already tried: Reset PRAM and SMC and nothing. It's black.
I will appreciate any kind of help.
Thanks to all
Rodrigo

I'm having the same problem. I took my iMac to a genius bar and they couldn't help. Apple needs to address this.

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IMac 24" Intel Core 2 black display on boot after update to 10.6.7

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