Brand new PC restarting after a few minutes of use

[brodiegeek]

To start, here are my specs:

CPU: Ryzen 5 2600

MOBO: ASRock B450 Pro4

RAM: Crucial Sport LT 16GB DDR4

Graphics Card: MSI GTX 970

PSU: EVGA 80+ Certified 430W

Storage: Intel 660p M.2 SSD

 

I have a very weird issue with a PC I just built. I put together the PC and was able to install Windows 10. Windows 10 then successfully booted, but after a few seconds of running, the PC crashed. I've had this same problem with another PC I built in the past, but the only component I am using from the old PC is the GPU.

 

Some more info:

• After the PC crashes, it will turn back on (lights and all) but it won't display anything. The fans on the CPU rev and derev in a sort of 2 second cycle. Very weird.
• The PC won't crash when in the BIOS

 

Things I have already tried:

• Moving the SSD to a different M.2 slot
• Reapplying thermal paste to the CPU
• Stress testing the GPU in another system (it didn't crash)
• Using a different GPU
• Using different RAM
• Using a different SSD
• Using a hard drive instead
• Using three different power supplies (all with enough headroom Wattage-wise)
• Reinstalling Windows 10 (four different times, now)
• Using different RAM slots

Based on the list up there, the issue can't be:

1. The GPU, because I stressed tested it in another system, and I tried using a different GPU in the system.
2. The SSD, because I tried using a different SSD and tried using a hard drive as well
3. The RAM, because I tried using different RAM (and I tested my own in another system)
4. The PSU, because I have used three different power supplies, and I've had the same issues across the board
5. Overheating, I have a fresh coat of thermal paste on the CPU and monitored it's temperature in the BIOS (39C maximum so far)
6. Incorrect RAM slot, because for one: it actually starts up, and for two: I tried every slot on the board

What it might be:

• CPU
• MOBO

This is a very weird problem, and I don't know how to fix it. I ordered a new motherboard and it will be here tomorrow. Any ideas?

[Nocte]

Given all the troubleshooting you did I guess it's most likely the motherboard. I have never heard of CPUs causing crashes. 

[brodiegeek]

Thanks for the confirmation. I've never had a motherboard DOA though, how common is that?