Model A1311 / Mid 2011 / 2.5 & 2.7 GHz Core i5 or 2.8 GHz Core i7 Processor

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iMac will not fully boot

So I've replaced the psu on this guy, and the logic board. I get 2 lights on boot for about 20 seconds, maybe more, then I got all 4 lights and the screen turns white. No post sound. All white screen, no grey Apple. Any idea what that means when you get all 4 lights green but still no boot?

PRAM zap yielded no change in behavior, but it did reset from doing it (got a black screen, booted, then all white screen.)

Ideas?

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Faulty, corrupt or incompatible OS. Try booting to an install disk or doing a Repair (command-R) boot.

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