I have been given a faulty Mitsubihi DA-U680 Stereo Amplifier for free. Before I consider the possibility of paying for a repair perhaps someone of a technical nature would offer an opinion for the following fault condition.

1. The unit powers up OK
2. There is no smell or outwood damage.
3. If I turn up the volume both channels increase in sound and the leds increase in range.
4. There is a very small content of the source recording being played but very small indeed.
5 But there is a white noise coming from both channels which is controled by the volume but is very much a fault condition.

Any ideas please.