[Gigabyte] No video with new 5850 (PCIe 2.1 problem?)

GA-P35-DS3L (rev 2)
HIS 5850
Q6600 @ 2.4 GHz
Windows 7 64-bit
Corsair 500w power supply.

I recently bought brand new HIS 5850 to upgrade from my current 8800GT. When I installed the 5850 on my system, my monitor would not receive any signal at all from the 5850. The fans on the 5850 spin and my system does boot because I can hear the Windows log in sound after a while. I even installed the 5850 on another system and it worked perfectly fine so I know it's not defective.

I suspect the problem may lie with my motherboard not being compatible with PCIe 2.1 cards. However, I have read some posts on this forum where some users have said that their system works fine with a P35-DS3L and cards like the 5750, which should also be PCIe 2.1, and I have never had any problems with my old PCIe 2.0 8800GT. I updated to the latest BIOS version on my motherboard and it did not work either.

Is there anything I can do to get the 5850 working or will I have to purchase a new motherboard?
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More about gigabyte video 5850 pcie problem
  1. It seems some PCI-E 2.1 cards won't work in PCI-E 2.0 slots
    "Hard one... I'm not sure why the XFX recommendation; as far as data xfer rates go, you shouldn't be able to 'fill up' a 1.0 with anything from a 5850 down, a 5870 might start to be 'getting close'; a 5970 (in the unlikely event you could lay your hands on one - TSMC problems seem to be screwing everyone...) will 'oversaturate' the bus, but that doesn't mean it shouldn't work, it should just be somewhat 'bottlenecked'; the available slot power wasn't changed: once a slot is configured as 'high power', all specs deliver 75W to the cards; the only thing I could imagine might affect compatibility is low-power state-management - that was changed significantly between 1.0 (actually 1.1) and 2.0/2.1... Might want to inquire of the manufacturer before purchase - they should know, and if they can't be bothered to answer, you can't be bothered to send a check their way"
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