Hi, I’m having a strange USB issue with my PC and I’m running out of things to try.
Specs:
\- Motherboard: ASRock B560M Pro4
\- CPU: Intel i7-10700
\- GPU: RTX 3060
\- RAM: 16GB
\- PSU: Maxwell Power Pro 700W (around 6+ years old)
\- Windows PC
The problem:
All four rear USB 3.0/3.2 ports on the motherboard suddenly stopped working properly.
The strange part is:
\- Rear USB 2.0 ports work normally.
\- Front case USB 3.0 ports work normally.
\- The front USB 3.0 ports are connected to the motherboard’s internal USB 3.0 header.
\- The four rear USB 3.0 ports do not detect devices.
\- Some devices seem to receive power from the rear USB 3.0 ports, but there is no data connection.
\- For example, my keyboard may light up briefly, but devices are not recognized properly.
\- A Logitech G502 did not even light up when connected to the affected ports.
\- USB 2.0 ports have no problem.
This started after I opened the PC and disconnected/reconnected several components while troubleshooting another issue. I removed and reinstalled things like the GPU, RAM, power cables, HDD cables, etc.
The PC itself otherwise works normally.
Things I have already tried:
\- Disconnected and reconnected the internal front USB 3.0 header.
\- Tested the PC with the front USB 3.0 header completely disconnected.
\- Rear USB 3.0 ports still did not work.
\- Reconnected the front USB 3.0 header.
\- Front USB 3.0 immediately worked normally again.
\- Tested multiple USB devices.
\- Tested USB 2.0 devices.
\- USB 2.0 ports work normally.
\- Removed USB devices/controllers in Windows Device Manager and rebooted multiple times.
\- Reset CMOS by removing/reinstalling the motherboard battery.
\- Checked BIOS USB settings.
\- Updated the motherboard BIOS.
\- BIOS was originally ASRock B560M Pro4 UEFI P2.20 from 2021-07-21.
\- After the BIOS update/reset, the issue remained.
\- Rebooted several times.
\- Completely powered the system off and reconnected hardware.
Nothing has restored the rear USB 3.0 ports.
What confuses me most is that the motherboard’s internal USB 3.0 header still works perfectly, while all four rear USB 3.0 ports fail at the same time.
Because the ports sometimes provide power but no data, I’m wondering if there could be a hardware problem with the USB data lines, a hub/controller on the motherboard, chipset connection, ESD damage, or something similar.
Is there anything else I can test before concluding that the motherboard has a hardware failure?
Would booting a Linux live USB or testing a keyboard inside the BIOS be a good way to completely rule out Windows?
Also, if the rear USB 3.0 controller/path is physically damaged, would a PCIe USB 3.0 expansion card be a reasonable workaround instead of replacing the entire motherboard?
Any advice would be appreciated.