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I recommend testing the system out of the chassis on top of a non-conductive surface; this could be a wooden table or a newspaper. Also while you are taking the motherboard out of the chassis, you can clear the cmos by removing the power cables from the motherboard ( 2x12 and 2x2) and the cmos battery for an hour. Once you have the motherboard out of the chassis and cleared the cmos, we need to test the motherboard on a basic configuration, this means have the system as basic as we can. Have only the power supply and the processor with its Heat Sink. We won't need memory or any other device as we are seeking for 3 long beep tones. If you receive the beep tones, then turn off the computer and test with one memory stick and the monitor connected.
Make sure that the RAM memory that you are using is compliant with the processor requirements, the memory should be natively 1333MHz at 1.5v latency 9, the Serial Presence Detect (SPD) settings need to meet those specifications in order to be able to boot.