Ok, so I bought an ATI Radeon 7500 PCI off eBay a few days ago for $36 (it has a serial and a DVI slot). Installed it yesterday, hooked up 1 LCD to the ATI 8500DV DVI slot, another to the ATI 7500 DVI slot, and the CRT to the serial slot in the 7500. WinXP recognized the new card, installed the...