First, the 6200 series runs at 8X AGP. If you do not have that specifically stated in your Bios (Its running at 4X for example) you might run into problems. I would suggest updating your Bios for sure, not only for the Motherboard but also the NVidia card's firmware if you can borrow someone else's rig. Make sure to check that Bios is using AGP instead of PCI or the onboard GPU.
Secondly, if you have installed nVidia drivers that do not work and simply install new drivers over the old ones, it will also lead to problems. You need to use a utility to clean out all traces of nVidia's DLLs as well as ATIs. Be careful as you can wipe out the onboard drivers as well (Which are ATI I think for that board). You can do this using a tool such as DriverSweeper
, but be prepared and make a CD with drivers on it just in case.
Lastly, if the card is not even being recognized by the installer you have can assume that something in BIOS is preventing that. Disable all resources via bios that are not used freeing up a ton of the IRQs. Such as Serial
connections, onboard sound, legacy USB etc etc. Get video working then turn each resource back on one by one till it sings.