NIC Failure after new Power Supply, Graphics Card Install

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After my graphics card died, I installed a new nVidea GeForce 8800GT, and a 470 Watt Dell-compatible power supoply to replace the 350 Watt factory-installed Power supply to support it on my Dell Dimension 8400.

WHen I boot, the embedded Broadcom NetExtreme 57xx network adapter fails to initialize. The message is:
"
Alert! Error initializing PCI Express NIC bridge.
NIC failure"

I followed the Dell support recommendation to refresh the power state without any success. I have checked the Power supply connections and all seems right. The light coming off the network cable is orange. I'm connecting to hte INternet via a wireless adapter, but clearly that's not a solution.

In addiiton, a possible related problem comes when I attemtp to upgrade to Vista. In the first restart during the install, I get a blinking cursor in the upper left corner of the screne after the Dell splash screen, apparently aborting the install. I've reverted to early OS (XP) at boot.

APpreciate any ideas.

Neil
 
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