In the bios, I changed the "default" video from AGP to Auto.
I want to have two monitors on my Dell GX240 computer (running Windows XP). I called Dell and they had me purchase (from Dell) the ATI/Radeon 512MB 3450PCIDMS video card.
I removed the original video card that came with the computer: Rage 128 Pro Ultra GL card from the AGP slot.
I installed the ATI/Radeon 512MB 3450PCIDMS video card into the pci slot.
When I try to boot up the computer, the diagnostic lights on the back of the computer are (amber, green, amber, green) which indicates a problem with video. No message is displayed on the monitor, not even the post tests.
When I removed the ATI/Radeon 512MB 3450PCIDMS video card, and install the Rage 128 Pro Ultra GL card into the AGP slot, the computer boots up just fine.
Your help is greatly appreciated.