Go to support.dell.com & input the service tag It should bring you to the 1950, select downloads & drivers, change the OS to windows 2000 - you should see the video card   [URL]
Trying to locate a Driver for a PowerEdge 1950  Service Tag  <ADMIN NOTE: Service tag removed as per privacy policy> on board VGA chip running Win 2000 Sever-Service pack 4, or alternative what type is the on board VGA Chip?  Control panel reports no information per type of chip. 
Power edge 1950 VGA Driver- Win 2000 Sever