#Pc not connecting to wifi and only 2/5 of io usb ports work

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fair axle
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PC Hardware Issue – Wi-Fi Missing and Most USB Ports Not Working (MSI B450 Gaming Pro Carbon AC)

Hello, I’m trying to troubleshoot an issue with my PC and would appreciate some help.

Motherboard: MSI B450 Gaming Pro Carbon AC
Issue: Onboard Wi-Fi and most rear USB ports are not working.

Background:

  • My RAM had been unstable for the past few weeks (randomly maxing out usage under no load).
  • Recently the PC stopped detecting Wi-Fi and most USB ports stopped functioning.
  • After troubleshooting, the system eventually stopped booting and the DRAM debug LED was lit.

Steps I’ve already taken:

  • Replaced the RAM with a brand new stick.
  • Cleared CMOS multiple times.
  • Booted successfully into BIOS and Windows with the new RAM.
  • Loaded BIOS optimized defaults.
  • Checked BIOS Integrated Peripherals and ensured:
    • USB controllers enabled
    • Onboard LAN enabled
    • Onboard WLAN enabled
  • Installed latest AMD B450 chipset drivers.
  • Installed Intel Wi-Fi drivers.
  • Updated BIOS via M-FLASH.
  • Tested multiple USB ports and configurations.

Current situation:

  • PC now boots normally with new RAM.
  • Onboard Wi-Fi does not appear in Windows or Device Manager.
  • Most rear USB ports still do not work (only a couple function).
  • Drivers and BIOS settings do not change the behavior.

Question:
Could this indicate a failed chipset or motherboard I/O controller, or is there another BIOS/driver fix I should try before replacing the board?

Any suggestions or additional diagnostics would be greatly appreciated.

sharp drift
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Have you tried reinstalling windows or trying a Linux live usb?

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Looking at the manual, 2 usb 3 5Gb/s ports are connected directly to the cpu, with the rest of the ports going through the chipset. I’m guessing it’s these 2 ports that continue functioning?
This board is pretty unique since most motherboards only have a single host controller

fair axle
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@sharp drift thank you, I think it’s the end for this board tbh 😪. Already tried everything and thats explains why I only have 2 usb ports available. I don’t think anything else I can do will fix it

sharp drift
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You tried a windows reinstall?

fair axle
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Yeah already did only thing left is replacing the cmos battery

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I’m not surprised if the motherboards dead it’s pushing 8 years old now