[SOLVED] Power Supply won't stay on

[kk4901]

New Build....tested the power supply with paper clip and it powers on and stays on. When connected to the motherboard it will turn on for maybe 2 seconds and then shut right off. I've reseated CPU, RAM have unplugged all cables and reattached. I've tried it with no hardware, with just a CD rom, with just a hard drive...same result always. The only thing I have not done is taken the motherboard out and reinstalled it. Will that make any difference...I don't see how. What's the best guess....a bad mother board?

 

[rgd1101]

full system spec? include make and model of the psu

 

[kk4901]

PSU-Red Dragon 600 watt Bronze
Mother-Asus Rock B365M Pro4
Processor-I5 6400T
RAM-2X8g Crucial Ballistix

 

[CountMike]

New Build....tested the power supply with paper clip and it powers on and stays on. When connected to the motherboard it will turn on for maybe 2 seconds and then shut right off. I've reseated CPU, RAM have unplugged all cables and reattached. I've tried it with no hardware, with just a CD rom, with just a hard drive...same result always. The only thing I have not done is taken the motherboard out and reinstalled it. Will that make any difference...I don't see how. What's the best guess....a bad mother board?

Paper clip test can show as little as that fan is turning, it's far from proof that PSU is in completely working order.
There's no "Asus rock" did you mean ASROCK ?
If yes is this one https://www.asrock.com/mb/Intel/B365M Pro4/index.asp#CPU ?
If yes, it doesn't support 6th gen Intel, 8th and 9th only.

 

[Zerk2012]

PSU-Red Dragon 600 watt Bronze
Mother-Asus Rock B365M Pro4
Processor-I5 6400T
RAM-2X8g Crucial Ballistix

That motherboard does not support that processor so it's not going to work.