usb not working

[Nomad]

hi fraser , thx for the reply, sorry i'v not been about to get back to you, i.v triyed every usb they all seem to be working ok, i downloaded the driver again and its asking me to connect to a device meaning to me anyhow its not picking up the usb of the devialet, it worked fine beforehand, my computers fairly new
im not sure how to use the air so im struggling to play music from net, gutted rely if its broke,
is a mac air easy to link to the devialet?