MoBo/System Power-on Issue

[Stainless Stove]

Hey, I'm having a problem where my computer won't turn on properly. Here are my specs:

 

AMD Ryzen 2600x

MSI B450 Tomahawk mobo

Sapphire Vega 56

GeIL EVO SPEAR 16gb DDR4

NZXT Kraken X62

NZXT S340 Elite case

CM MWE Gold 650W 80 Plus PSU

Some samsung 250gb SSD

 

HERE IS A GIF OF THE PROBLEM HAPPENING

 

When my computer is shut down, it will not power on properly. If I hit the power switch, the computer will turn on for a split second (fans, gpu start etc) but then immediately shuts back off. After this happens, the power switch will not work unless I unplug the cable from the PSU for a couple minutes and then plug it back in. Additionally, trying to short the mobo without the power switch produces the same effect- I can jump it once, but then shorting it again does not do anything until I unplug/repug the psu cable. I built this computer from (new) parts about 6-7 months ago.

 

Since last night, I have been able to get the computer to turn on and stay on once- though there was no display output and the red BOOT debug led on the mobo was lit up.

 

HERE'S THE GIF AGAIN IN CASE YOU MISSED IT

 

I have tried unplugging each of the GPU, ram, and SSD individually to try to isolate the problem, but nothing helped. Unplugging all peripherals from the backside did not help either. Because my build does boot/run occasionally (has been..), I feel it is more likely to be a mobo than a PSU problem. I have also tried using a different PSU cable, and outlet. I’ve also tried removing the CMOS battery and reseating the 24-pin cable to no effect, as well as trying the PSU paperclip test (which worked fine). The ram sticks are also in the correct slots.

 

I've seen that there seems to be some cold boot issues with the B450 boards, but none of those issues seem to be similar to mine. Any ideas?

[Applefreak]

Looks like a charge issue on the capacitors. It can be the motherboard, it can be the PSU it can also be something like too much load on a single cable or connector. Did you split any of the PSU cables for example into two or more outlets?

A defective component like a fan might cause the same issue, are all fans spinning up?

 

Did you change anything on that pc before this happened?

Do you have another PSU?

 

[Stainless Stove]

1 hour ago, Applefreak said:

Looks like a charge issue on the capacitors. It can be the motherboard, it can be the PSU it can also be something like too much load on a single cable or connector. Did you split any of the PSU cables for example into two or more outlets?

A defective component like a fan might cause the same issue, are all fans spinning up?

 

Did you change anything on that pc before this happened?

Do you have another PSU?

 

No, this PSU is modular and each of the cables runs to a separate outlet (and never more than one). I shorted the PSU with a paperclip and tested the voltage output on all of the 24-pin cable pins and everything read fine. I also tested some of the other psu cables and they read the correct voltages as well.

 

When I short the PSU, all fans in the case turn on and run properly.

 

I did not change anything in the build, I had taken it outside and cleaned it but did not remove or modify anything in the case (the problem has been happening for a couple weeks, including before I did this cleaning).

 

I do have another PSU however I don't really want to completely unbuild my rig to swap them yet.