I just bought a GX260 Dell Optiplex computer that used a special video card for a terminal output. I removed the card so I couyld connect to teh on-board video but I get no video output. Is there a jumper I am missing to turn on the on-board graphics?

I want to ask that will dell gx260 supports 512 mb agp .if yes so of which company please tell me acorrect and full information because i am not knoe any thing about agp

No you do this in the setup of the cmos. look for a key to hit to enter setup during start up of the computer. sometime it is del and sometime it is an f key. once in cmos setup look for system devices and enable on board graphics. this had to be disabled to use the other graphics card. good luck get back to me if you need more help