Screen no longer works after Graphics Firmware Update

I received my new IMAC 20 inch a couple of days ago. Worked like a charm. perfect.
I received a request (software update) to update the Graphics firmware for the ATI 2600 processor.
I performed the update, but I can no longer use the IMAC. The screen just stays black, no longer displays any information. I hear the hard disk working thru the startup process, but the screen just stays OFF.
I zapped the PRAM, and restarted many times. No success.
Please help. It worked so fine before this major trouble.
Patrick

The iMac Graphics Firmware Update 1.0 states:
This update is for 20-inch and 24-inch aluminum iMac computers with the ATI Radeon HD 2600 PRO graphics processor, running Mac OS X 10.4.10 or later with iMac Software Update 1.2.1 for Tiger, or Mac OS X 10.5 with iMac Software Update 1.3 for Leopard.
Perhaps you meant OS 10.5.1. The above update also states:
Note: If you are running Mac OS X 10.5.1, iMac Software Update 1.3 is included.

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