Question Gpu fans not spinning on boot up.

Nov 19, 2022
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This is a bit of a long one.

I have 2 PCs, one is my main and the other I'm building from my old parts for a friend.

To summarize the issue, the old GPU works in my Main PC but the fans dont even spin on boot in the PC I'm building for my friend.
"Older PC" is a 'fresh' PC with no windows in it yet, mostly old parts, new parts are the CPU, PSU, Hard drives, SSD.

The older pc specs are CPU: Ryzen 5 3600, MOBO: Asus Prime B450M-A, GPU: RX 580 armor OC, PSU: MSI MPG A650GF, RAM: Ballistix Sport LT 8gb (2x4gb)

My main PC specs are CPU: Ryzen 7 5800x, MOBO: GPU: 3060ti, PSU: Corsair RM750x, RAM: Corsair Vengeance 16gb (8x2gb)

Troubleshooting Steps:
Used different Mobo on older PC, nothing shows up on the screen.
Tried same PSU, 2 different PSUs though, as in sent first back and got new one of the exact same psu, did not fix the issue.
Switched RAM on old PC with new ram, nothing.
Switched my GPUs around, both worked in opposite builds, 3060ti fans spun upon boot on old PC, RX 580 fans spun and got to log in screen in main PC.

Only thing I haven't tried is changing CPU around because I have a rad on my main PC and to much trouble to test change those around, and I am waiting on any advice before buying a Ryzen 5 2600 again because that was my old cpu I used in this, but when building the friends PC I dropped the R5 2600 and broke some pins, if that's the glaring issue I would be find buying it and beturning the R5 3600.