CPU_Fan Header

I recently purchased a GIGABYTE B550M DS3H Motherboard. After assembling the computer, it boots and loads fine but the CPU fan does not spin (confirmed it's connected to the CPU_Fan header) I tried another fan connected to the header and it doesn't spin. However when I connected to the SYS_Fan header the cpu fan starts spinning. I believe the CPU_Fan header is broken, are there any other troubleshooting steps I can take before I return the motherboard for a replacement?


  • PowerSpec_MikeW
    PowerSpec_MikeW PowerSpec Engineer
    5 Insightfuls First Anniversary First Comment 5 Awesomes
    Sounds like you've done everything you can to narrow it down to the CPU_FAN header being the issue. Verify the fans that failed on the CPU_FAN header all work on the SYS_FAN. If you have an AIO or W_PUMP header I usually test with these, as they're set to full speed and will rule out an issue where the board is undervolting the header. At that point, I would exchange the motherboard.
We love seeing what our customers build

Submit photos and a description of your PC to our build showcase

Submit Now
Looking for a little inspiration?

See other custom PC builds and get some ideas for what can be done

View Build Showcase


If You Can Dream it, We Can Build it.

Services starting at $149.99