I have an issue when running these cards together in a dell optiplex 990.  once the 2nd card is installed. the PC will not boot. remove the card, it boots fine.  I was temporarily running 2 different cards at the same time until these 2 came in, they were an Ati Radeon HD6350 and ATI RADEON HD2400 XT.

If i try and run one 2450 with one of the other radeon cards, it will not boot either. i have updated the bios and checked the bios settings and I cannot find anything that will make this work.  Am i missing something?

thanks