Question i5-6400 based computer powers on then instantly off ?

Nov 1, 2020
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I just bought a new motherboard, Ram and Power supply. The only previously used components are a Radeon HD 6870 card and my I5-6400 CPU. I made sure all parts are compatible. my power supply is 430w. The computer powers on and the fans spin for a second then the computer turns off. I have tried removing the Radeon card and nothing different happened. How can I test the CPU or should I just buy a new one? I do not have a spare motherboard
 
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