It has a 3.5 aux out jack in the back for putting sound into other devices. So depending on if your device has an 3.5 audio in port. You can use your standard head phone jack cable to transfer sound from the projector to the amp. If you need the RCA Audio cable (red and white audio cables.) You'll have to get a 3.5 aux to RCA audio cable to connect the projector to the amp. I have a sound system that only has the RCA hook ups for it so I have to use a 3.5 to RCA cable to transfer the sound and it works like a charm. Hope that helps.
No, I've not had that or any other problem Richard.
If the unit is still under warranty send it back.
There is an 'auto input select' feature built into the unit, and when selected the unit scans each input for a signal. Try changing the setting to manual selection perhaps?
If the unit is out of warranty, and before I'd have it repaired, I'd personally remove the cover to see if there is a connector loose and so on.