Im trying to plug in a mic to my PC. I am using Mic rather than Line In if this makes a difference. About 10 seconds it just switches off, it is not muted and I can hear other sounds.
The only way to get it to come back is to go into the Mic Properties and tick Listen to this device then untick (because when ticked there is a 1 second delay). The sounds returns but again only for 10 seconds or so