ASRock K7S41GX issues

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   If this is the same board from your competition entry the entire board needs to be cleaned. I noted caked dust on your RAM slots as well as other areas. The only way to clean a motherboard relatively safely is to use an old toothbrush and isopropyl alcohol and gently scrub the contact points with the alcohol. You have to be careful however as the bristles on toothbrushes are nylon and can conduct static so be sure to use an antistatic wrist strap and avoid scrubbing any of the boards ICs. As for the burned pin the best you can do with that is to use a thin flat head screw driver and scrape off the charring from the pin then use isopropyl alcohol to scrub out the blackening in the plastic and surrounding pin. The odds are however that the burned pin caused permanent damage to the board. I assume when you say power input socket you are referring to the 20pin power connector from the power supply to the board. If the CPU socket itself is damaged the board is toast, as parsec said, repairs like this, while possible in a professional electronics service center are too costly to perform to be viable and even with replaced components it is likely that there is further damage to the board.
As for the overheating issues you must be sure that you have installed the cooler correctly. The Socket A CPUs do not have a heatspreader on the die so your cooler makes direct contact with the core. One of the common mistakes made with these CPUs in their day was to use too MUCH thermal compound. People would read about using X amount of thermal paste and not realize that that amount was designed for an intel CPU with a heatspreader. For the socket A CPU you actually want to apply as little thermal compound as possible. The layer should be near transparent. Also be sure there are no scratches or machining marks on your CPU cooler, this will severely decrease cooling performance on a Socket A system. 