|SUCCESS - The very last attempt . if it failed the next step was trying another PC.|
Of course immediately installed missing second bracket that holds bridge against cooler. With both e-6200 PCI and BFG 7800 AGP cards installed, and no drives connected and no CMOS battery, still no display.
Rapidly switched VGA monitor from AGP to PCI and back several times,
and FINALLY A DISPLAY - on the AGP 7800.
Into BIOS, but of course no drives to boot to. Live installed CMOS battery: NO DISPLAY. Shut down to remove battery and connect hard drive. Had to repeat above and succeeded.
Later able to boot with battery installed. I believe the crude Dell BIOS setting for video controller is the problem. BIOS needs to stay cleared until card is recognized.
Default BIOS is AGP at 128mb aperature, even with PCI video card installed.
Dell 305w PSU will run this card, even if 7800 video card on same 18A rail as CPU.
Had to uninstall and reinstall the same Nvidia driver set, for 7800 to use the drivers. The 7800 GS using default VGA drivers runs far better than the e-6200 did.