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I would suggest you to take the system out of the chassis, place it on a non-conductive surface like a newspaper, a magazine or something similar, leave only motherboard, power supply, processor and Heat Sink/fan. Remove all the rest of components. This would be to check for any grounding issues.
Then clear the CMOS removing the CMOS battery and all power cables from the power supply to the motherboard, leaving the system without power for 20 minutes at least
After the 20 minutes reconnect the 2x12 and 2x2 power cables. Power up the system and check if the system beeps
If it beeps (3 beeps) it means that the system is posting and the problem could be related to memory
If the system does not beep, then add one memory stick and try a BIOS recovery with the instructions on the following site: (you don't need video to try this)
Be sure to disconnect all peripherals not required for the update, even the mouse, keyboard, hard drives and any other CD/DVD ROM, this may take up to 15 minutes even if there is no display on the system
While this is being tested, please post the part number of the memory sticks you have tested with?