On my device the 3 non-powered USB ports work fine, but the yellow (powered) port doesn't work at all. I don't see anything about this in the bios. Any help or suggestions would be greatly appreciated.
The "Portable Device Charging Mode" option in BIOS under Advanced>Devices>USB controlls the yellow port. Is it set to "Charging Only"? I believe it must be set to "Charging in S3" to enable the port for other than charging.