Behringer Amp 800 PROBLEMS !!

[Homechill Recor]

Hey

I just bought the Behringer Amp 800
Behringer: MINIAMP AMP800

And I having a lot of problems, I only get feedback in my headset when it's off but when I press it and turn it on there nothing??
who can that be, as soon as all the lights is on it doesnt give me any thing and I can only use ONE of the 4 channels... why???

PLEASE HELP

PEACE

- Daniel Svensson (Denmark)

 

[mjbphotos]

Feedback? As in high squeally sound that hurts the ears?
Are you sure you have it connected correctly/ Sorry but the language difference makes it hard for us to advise - maybe you can provide a diagram of how you have it hooked up.