8800GT will not detect monitor on one of the DVI ports

[Thug Esquire]

1. Overview of the problem
   After switching to a new motherboard and an aftermarket cooler, my 8800GT no longer recognizes monitors through one of its DVI ports.
   
   
2. Full description of the problem and symptoms
   My eVGA 8800GT worked perfectly in an Asus P5W DH Deluxe with an Intel E8500, 6GB of OCZ DDR2 800 RAM, 64-bit Vista and a 500W Antec Neo HE PSU. I switched to an Asus P5K Premium/Wifi-AP and 8GB of G.Skill DDR2 1066 and replaced the stock eVGA cooler with an Arctic Cooling Accelero S1 rev. 2. Now everything posts correctly and I can boot into Windows without incident, but the DVI port that used to be my primary port no longer seems to work, even though the monitor can tell it is connected to a DVI port because it doesn't show the "no DVI connection" warning. When I plug either of my Dell LCDs into the working port, they work, so as far as I can tell, the monitors are fine.
   
   I do not get any error messages or BSODs, any weird beeps or crashes, and I've tried uninstalling and reinstalling the nVidia drivers. I have also tried "rigorous display detection" and that couldn't detect the monitor either. When I go to the nVidia control panel it only lists the monitor that is connected to the working port.
   
   I am plugging the 8800GT into the blue PCI-E slot, which is the primary x16 slot according to the mobo's manual.
   
3. What could have caused the problem
   I may have incorrectly installed the aftermarket cooler, but I followed the directions carefully and haven't cracked, scuffed, or bent anything.
   
   The mobo might be having trouble addressing 8GB of RAM plus 512MB of video RAM but I'm not sure why that would prevent the second DVI port from working.
   
   The video card has a power connector for its stock HSF. Perhaps the card is only activating one of the DVI ports because it can't tell that the cooling is working, but nobody else seems to have had this problem.
   
4. Reproduction Rate
   I've rebooted many times and everything else seems to be working correctly, but since I put this card in the new mobo with the new cooler I haven't gotten any video out of the primary DVI port. The video card is correctly identified in Vista.
   
5. I already tried these steps:
   I already uninstalled and reinstalled the nVidia drivers. I already tried reseating the card.
   
6. My software:
   • Vista 64-bit SP1
   • AVG Anti-Virus 8
   • Windows Firewall
   • I don't think it's a software problem.
7. My hardware
   • Asus P5K Premium/Wifi-AP
   • Intel E8500 (stock speeds/cooler)
   • eVGA 8800GT
   • Four 2GB sticks of G.Skill DDR2-1066 (2.1v at 5-5-5-15)
   • Antec Neo HE, 500W
   • Arctic Cooling Accelero S1 rev. 2.

Thanks for any help you can provide!

 

[robisbell]

more than likely the aftermarket cooler damaged your card.

 

[Thug Esquire]

Originally posted by: robisbell
more than likely the aftermarket cooler damaged your card.

Yeah thanks but actually I didn't; both DVI ports on the 8800GT work when I plug it into a different motherboard. Further, both DVI ports on a 6800XT work when I plug it into the P5K Premium.

 

[robisbell]

then you've either have a bad PSU or damaged video card slot, or both. from what you stated the info indicated that the aftermarket install had damaged the video card.