Z68A-G45 (G3) - NO VIDEO when two GPU's are running in SLI

Very strange things going on with this mobo.  I HAD two GTX 465's running fine in SLI.  At some point, the PC decided to start acting very strangely. Randomly, I booted up to no video output.  The system POSTed okay, and I heard the Windows login sound.  However, I had no display signal.  The BIOS wouldn't even display, so I knew this was not a Windows problem.  I took one of my GPU's out, and it worked fine.  Signal worked to the monitor.  I took that GPU out, and installed the other one in its place.  Same thing, the video worked fine.  Then, I decided to test the other PCI-E slot.  I tried each GPU in that slot, and each worked fine.  I had video and no problems each time.  Then, I tried the SLI bridge on my neighbor's PC.  It worked fine.  So, the PCI-E slots are not the problem, the GPU's are not the problem, and the SLI bridge is not the problem.  SLI WAS running just fine until some random point in time when I booted up my PC to no video signal.  At some point I cleared the CMOS, and eventually the SLI configuration worked okay again.  However, the same thing happened again the next time I booted.  It's very strange.  I want to say it's a bad motherboard, but the video signal seems to not work randomly, and does seem to work again eventually.  I was thinking that it might be a bad monitor or DVI connection, but the video signal never went out at all when running just one GPU.  I'm running on an 850 watt PSU.  I DOUBT this is the problem since the PC actually does boot up to Windows 7, just without a video signal.  Anyone have any insight into this issue?  My first guess is a bad motherboard. 

Quote from: Bernhard on 07-December-11, 03:53:34
What PSU is that and how old is it ? How many amps does it have on the 12V rail ? You should be able to see that on the label on the side of the PSU.
If you only use one card, you said you can get video. So boot up with one card only and clean out all drivers and start with afresh driver installation.
If all alse fails, remove the cards completly, do a CMOS clear and it should default to the integrated graphics. That will allow you to get into the system and do the driver clean up.
After that insert only one card and check if it works. Then you can re-install the drivers and retest after disabling the integrated again of course.
Okay, I tried all of the above.  Still no video output with both cards in.  I'm guessing this is a bad motherboard.  This wouldn't be the first time this has happened with an MSI board for me (and I'm sure not the last).  So frustrating.....  The weirdest part of all is that I HAD the system running fine with SLI...  Out of nowhere it just wouldn't boot up with video for some reason.  Then it magically worked again.  Now, it's the same problem.

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