Crossfire formula iv cant run two cards now

Crossfire IV Formula with dual 6950's in slot's 1 and 3. The other day it wouldn't post. This only happens if both cards are in the machine. When I remove the card in slot 3 it boots. When I swap that card for the one in slot 1 it both 6950's are ok. My guess is a motherboard problem....any idea people?
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  1. If it does boot with a single card in slot 3 it is probably a PSU problem if not motherboard.
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