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The two lights being on, and not booting is an indication of a bad MB.
Since you have opened and re-seated the memory, go ahead and take out the memory, and boot. What happens? Does it beep. If so, then put the memory back in, and disconnect the hard drive. Does it beep again? If it does, then the MB is good(99.9%).
What OS? Can you boot into safe mode?
Since you have opened and re-seated the memory, go ahead and take out the memory, and boot. What happens? Does it beep. If so, then put the memory back in, and disconnect the hard drive. Does it beep again? If it does, then the MB is good(99.9%).
What OS? Can you boot into safe mode?