Well, the good news is that the replacement nVidia 8500GT video card for my Gateway GM5478 arrived. Gateway sent it to me as a warranty replacement for the original 8500GT that failed. The bad news is it does not work. In fact, when I install the replacement nVidia 8500GT and press the power button, the only thing that happens is that the blue light around the power button illuminates. No CPU or power supply fan, no hard drive spinning up, nothing. When I remove the nVidia card and use the integrated video port again, the PC works just fine.
So, I guess another round of troubleshooting and support center communications will commence. Sigh.
Has anyone else seen this issue? Have you been able to get it resolved?