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What brand is your PSU?
The drivers are irrelevant. It should work regardless of the software on the PC.
Have you tried booting it with only 1 videocard in? Then set it up for 2 in Windows?
The memory shouldn't have to be pulled either, but what you could do is take out the little watch battery on the motherboard for 1 minute and put it back in. This will reset all BIOS options.
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