Greetings. This might be a stupid question. I'm using a Fujitsu Lifebook S710 on Windows 10 and running a Rosewill mechanical keyboard through a USB. Suddenly the keyboard is not being recognized (although the integral one on the laptop is). Tried changing USB ports and a different keyboard (and obviously rebooted several times) but no joy. Checked on device manager and all USB ports are showing as working correctly. Anything obvious that I might now try?