PC build starting up and shutting down

Aug 11, 2018
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I'm working on a new PC build that is starting up and shutting down only a second later.

The first time this happened I had received all the parts from Amazon, assembled them, hit the power button, the fans and mobo light would flash on for a second, then turn off, accompanied by a click in the PSU. I took it to a local PC repair shop, where we breadboarded the mobo with only the PSU's main cable and CPU attached to it. Same thing. Tried another PSU same thing. Okay, it's probably the mobo or CPU.

I return the mobo and CPU to Amazon, and get the replacements today.

Assembled my build once more. Same thing happens. I'm frustrated.

This time I unplug half the CPU cable so I'm using four pins instead of eight. This time it boots up for longer. Click. Starts to boot again. Click. Repeated until I cut power from it. Okay, it seems to be working better-ish(?). Breadboard it again on my own this time. Disconnect everything from the mobo except for main PSU cable, CPU, and RAM (the RAM didn't affect anything either way). Repeats the same start up, shut down, start up, shut down, and so on.

At this point I think it has to be the PSU, but I'd like to hear another opinion before I send it back and replace it with Amazon.

Thank you for any help you provide.

Parts in my build:
Motherboard: GIGABYTE GA-B250M-DS3H LGA1151 Intel Micro ATX DDR4 Motherboard
CPU: Intel 8th Gen Core i3-8100 Processor
PSU: CORSAIR TXM Series, TX550M, 550 Watt, Semi Modular Power Supply
GPU: EVGA GeForce GTX 1060 3GB GAMING, ACX 2.0 (Single Fan), 3GB GDDR5, DX12 OSD Support (PXOC) Graphics Cards 03G-P4-6160-KR
Case: Corsair CC-9011023-WWCORSAIR CARBIDE 200R Compact ATX Case
RAM: Patriot Memory Viper Elite Series DDR4 8GB 2400MHz (PC4-19200) Single Module (Black/Grey) - PVE48G240C6GY
HDD: WD Blue 2TB Desktop Hard Disk Drive - SATA 6 Gb/s 64MB Cache 3.5 Inch - WD20EZRZ
SDD: ADATA SU800 128GB 3D-NAND 2.5 Inch SATA III High Speed up to 560MB/s Read Solid State Drive (ASU800SS-128GT-C)
 
Aug 11, 2018
2
0
10


I feel ridiculously dumb right now. Thank you so much for pointing that out. So is my CPU totally fried, or will I be able to replace the motherboard and be good to go?

Thanks again!