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Interesting problem, Gil. I don't think this is a big problem. This is probably a BIOS problem with handling SLI. In the olden days, we had this kind of problem as the mobo manufacturers scaled up to the new types of video platforms.

Usually, I'd ask my clients to wait it out and check the mobo manufacturers web site periodically for BIOS updates. And to install one only if the update specifically addressed the issue they were having with video.

I would ask if you have the monitor set on 'Auto' resolution?

 

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Huh. I didn't think about the fact that it was working fine and suddenly went bad. Kind of points to a PSU or GPU going bad. Do you have substitutes for either one of them? If so, try one at a time.

Unless you were doing something with the drivers. Like doing a driver upgrade. Then you might want to roll back the upgrade.

 

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If there is a glitch in the PSU circuitry, or a component failing, since your GPU is such a power hog, and it requires up to 150W, with a minimum 500W PSU. Here's some info the GPU manufacturer provides about power requirements:

500 Watt or greater power supply with two 75W 6-pin PCI Express power connectors recommended (600 Watt and four 6-pin connectors for AMD CrossFireX technology in dual mode)
Certified power supplies are recommended. Refer to AMD Certified Power Supplies for a list of Certified products