Question PC re-boots after shut down

Dec 27, 2020
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Hi, I have built hundreds of pc's in the past but never come across this problem. I had a spare I7 CPU so I bought a Asus skt 1150 Z87-K motherboard from eBay and a brand new Coolermaster 700w PSU.

I have two issues, the first is when I shut down from windows 10 the pc shuts down then starts up again 5 seconds later. Even when I disconnect the hard drive and enter the bios then shut down by pressing the button for 5 seconds it still boots up again. I have disabled fast boot and all the start up on mouse move etc. are disabled.

The second issue is I have tried to install a Asus GTX 750TI in both PCIe slots (connected with the 6pin PCIe power skt) but do output signal. A standard GPU with no extra power works fine.
I have tested the PCIe power skt and it does have 12v output.

Does this sound like a power supply, motherboard or may be even the cpu?

I have the motherboard out of the case and used 2 different power buttons, keyboards and mice.

Any thoughts would be appreciated.

Cheers
Matt
 

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