You already gave your answer to the problem, you said it does not post Ie one beep of the bios to say all the hardware checks out ok. But you said when you take the memory out it gives you eight beeps to say there is no memory fitted in the system. That means the bios is working first of all so the board cannot be at fault. And the second is if it does not boot on replacement of the memory it has something to do with it.
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