|You will have to install a PCI video card. I checked newegg & selected the cheapest with free shipping...GeForce FX5200 256MB 128-bit memory for $30 after rebate:|
It only has VGA ports though. If you need a DVI port, there's this Geforce 8400GS with 512MB 64-bit memory for $40 after rebate:
The 8400GS is the better of the two.
"BIOS not installed"
Are you sure that's the error message? The system can't boot without a working BIOS.