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I replaced motherboard. It doesnt react to anything, just pulsating red led on the back of motherboard

hi, I have S2 and it doesn't boot up at all, just black screen. I opened it to see whats inside. I see a red led blinking near RAM (just between the cam and the battery). When I jold the power button, the led turns off. Has anyone a servixe manual or know what to do, to see whats wrong? I...