Question Pc runs for 27 seconds then reboots then repeats this process

[Certifiedvon]

I'm new to pc building this is my first build, my pc runs for 27 seconds then reboots. when I remove the psu cpu cable it runs fine. i removed everything 1 by 1 to see what was the problem and my only solution is it'll only run without rebooting when i remove the psu cpu cable. So, should i replace the motherboard or the psu or is there something else wrong or could it be because bios isn't updated.

AMD Ryzen 5 5600X 3.7 GHz 6-Core Processor
ID-COOLING ZOOMFLOW 240X ARGB 62 CFM Liquid CPU Cooler
Corsair Vengeance LPX 16 GB (2 x 8 GB) DDR4-3000 CL15 Memory
Western Digital Blue SN550 1 TB M.2-2280 NVME Solid State Drive
Phanteks Eclipse P360A ATX Mid Tower Case
EVGA SuperNOVA GA 650 W 80+ Gold Certified Fully Modular ATX Power Supply
ASRock B450M/AC R2.0 AM4 AMD Promontory B450 SATA 6Gb/s Micro ATX AMD Motherboard
ASRock Challenger D Radeon RX 6600 XT 8GB GDDR6 PCI Express 4.0 Video Card RX6600XT CLD 8GO

 

[Juular]

It POSTs, boots and works fine without EPS cable connected ?

 

[Certifiedvon]

yes it will keep running without it being connected but i haven't connected it to a monitor yet because i wanted to find out what was wrong

 

[Juular]

yes it will keep running without it being connected but i haven't connected it to a monitor yet because i wanted to find out what was wrong

What ? So you don't know if it keeps running, or rather it it POSTed at all after all ? It shouldn't work without EPS cable, you're just confusing us. Does the PC actually reboot (with EPS cable connected as it supposed to be) or it's complete shutdown to halt ? Why exactly 27 seconds ? Does it always reboot exactly at the same time ? Did you enable RAM XMP ? Disable if so.

 

[jonnyguru]

yes it will keep running without it being connected but i haven't connected it to a monitor yet because i wanted to find out what was wrong

That's not how it works. That's not how any of this works.

You need to plug in the monitor to see if it POSTs or boots.