[SOLVED] PSU powering ONLY cpu fan

[CosmicJoshotron]

SYSTEM: AMD Ryzen 5 5600x
Msi Rx 6600 8GB
B450M Ds3H wifi motherboard
2x8gb vengeance ddr4 ram
700w thermal take 80plus smart series psu

I tried 2 Apevia psus off of Amazon, the first one didn’t boot at all, second one only booted up the cpu fan and the connected case fan. I have a splitter for 3 other fans that plug into the system fan slot, none of those as well as my gpu are booting. In between the first and second Apevia GPU I used my old 400w EVGA psu and it booted the cpu fan and the gpu fans turned on but the system fans didn’t. Now, only the cpu fan is turning on. This is the third psu that I’m trying and it’s all having the same issues. I have even gone back and retested the 400w and it’s having the same issues of not booting up my gpu or case fans. I ordered a new mobo because that’s what I think the issue is, but im wondering if anyone else has had their psu power ONLY the cpu and connected fan and nothing else.

 

[rgd1101]

was this pc working before?
did you upgrade/change components other than the psu?

 

[CosmicJoshotron]

was this pc working before?
did you upgrade/change components other than the psu?

Sorry, should’ve mentioned that. Yes this system was working perfectly with the 400w evga psu. I was attempting to upgrade my gpu, and as a result got a new psu. That’s when the issues started

 

[rgd1101]

is the psu modular? did you reused the old psu cable?

sound like the power to the motherboard is loose

 

[CosmicJoshotron]

is the psu modular? did you reused the old psu cable?

sound like the power to the motherboard is loose

Non modular, and I am using the new power cable that came with it. Also, I have double checked my connections and there is nothing loose. Is it possible that the 24 pin connector itself is damaged?

 

[rgd1101]

is just the fan not working or not booting at all?

 

[CosmicJoshotron]

is just the fan not working or not booting at all?

Not booting at all, gpu and fans aren’t turning on and no display.

 

[rgd1101]

take everything off but the gpu cpu ram
undo all those extra case fan

 

[CosmicJoshotron]

Update: it was the motherboard. New one came in today and everything booted perfectly with the same psu. One of two things possibly caused this, I damaged the 24 pin connector at some point or the crappy psu fried the 24 pin connector. Realistically, probably the first option.