Thanks for replies, never had it connected to a computer. Managed to get a video of it, sometimes works briefly then makes a digital glitch sound and usually goes silent, I am sure it was putting DC out of the audio output or non-audible frequency at one point, (causing VU meter on mixer to go up) like it had crashed. Sometimes the buttons still work, sometimes they all freeze up.
https://youtu.be/CTvvrPIGeKY
OS is 5.1.3.0