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Sounds like a heat issue with the CPU, or possibly the PSU.
What brand and how many watts and amps is your current power supply?
What processor slot type are you using?
Did you use rubbing alcohol to remove the old thermal compound and reapply new quality compound when placing the CPU & heatsink on the new motherboard?
Is the CPU fan blowing into the heatsink?
Is the heatsink getting warm to the touch before the computer turns off?
Can you monitor the temps of the CPU in bios before the computer turns off?
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