The Device Is Displayed In Device Manager With A "?" Mark; Cannot Connect A Usb Device - Buffalo IFC-PCIE4U3S User Manual

The device is displayed in Device Manager with a "?" mark

The drivers are not installed properly. Refer to the "Quick Setup Guide".

Cannot connect a USB device

No empty USB port available
Notes:
• Only USB 3.0 hubs are recommended for use with the IFC-PCIE4U3S. Hubs must support
USB 3.0 to perform at 5 GBps speeds. Non-compliant hubs will throttle all USB traffic to USB 2.0
or 1.1 speeds.
• For best results, USB hubs should be self-powered, or all USB devices connected to them must
include their own power supplies.
• Some USB devices do not support USB hubs. These devices will have to be plugged directly to
a USB port on the computer to function.
4
Remove a USB device, or connect a USB hub to use
more USB devices.