Symptoms
- USB ports on the front of the case don't recognize any devices
- Rear motherboard USB ports work fine
- Problem started after building the PC or moving/cleaning it
- Some front USB ports work but others (like USB 3.0 specifically) don't
Likely causes
- CommonFront panel USB cable not connected to the motherboard headerThis header is easy to overlook during a build.
- CommonUSB 3.0 front panel cable connected to a USB 2.0 header, or vice versaThese headers are physically different and not interchangeable.
- PossibleCable connected backward or offset by one pinThis is a common wiring mistake that prevents proper function.
- Less commonFront panel USB header disabled in BIOSUncommon, but some boards allow disabling specific headers.
What to do
- Open the case and locate the front panel USB cable connector(s) coming from the case.
- Confirm they're plugged into the matching header type on the motherboard: USB 3.0 cables need a USB 3.0 header, and 2.0 cables need a 2.0 header.
- Check the connector orientation against the motherboard manual, since it's possible to connect it backward or misaligned.
- Test a device you know works, like a mouse, directly in each front port to isolate the issue.
- Check BIOS settings for anything related to front panel or onboard USB headers being disabled.
- If cables are correctly connected and it still doesn't work, the header or the ports themselves may be faulty.
Tools and parts
- Motherboard manual
- Screwdriver
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.