X5DA8-0 wont boot with eGeForce 6200

I have a dual Xeon mobo. SuperMicro X5DA8-0. I have had an old Matrox G-450 card and even though I don't game, the old card is showing some age.

I was in Circuit City yesterda and picked up a e-GeForce 6200.

I came home and happily installed it. When I plugged in the power and rebooted, it recognized all my drives in the bootup, but then showed me the dreaded message "No Operating System Found".

No worries, right? I have seen this before and it usually means that I have unplugged the power or cable to the boot drive. Power down and check all cables. No joy.

Can't be a fried mobo or anything, I hope not.

I fire system back up and run the SCSI utility (my boot drive is an Ultra-320) and it verify's all A-OK.

Reboot---No Joy! No Operating system found.

I pulled the new card and put the old Matrox card back in and the computer booted up just fine into XP.

Now, I was thinking that maybe the new video card is too advanced for the old mobo. Some boards this old were only AGP 4x. I dig out the manual and there it says in the manual -- AGP 8X. New card is AGP 8x.

Do I have a bad card, or maybe it just won't work in this computer.

Thanks,

Kirk