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Without knowing what make and model of whatever you're asking about we can't be specific.
But if all outputs are distorting. Either the preamp is driving the amp too hard, or the amp is fried and needs repair/replacement.
At this point, I would just take it to a tech rather than poke around in it. It sounds like the power section is the problem as you have guessed, but without the technical knowledge you'd be shooting in the dark. That particular amp is right on the line of being expensive enough that would be worth repairing, but you might do just as wel to check Ebay for another used one.
That's a bad sign. A dead short in the output results in a short of the audio output transistors. I believe that to be the problem and a fairly simple fix to someone good at soldering BUT, you can't get parts for behringer equipment. Most components are specially made for behringer. I've been working on an amp for 6 months and I can fix it BUT, I can't find the parts anywhere, or can even find any reference to them online. Without a reference to the specs, I can't even get a generic replacement. Check your music stores in you area, a behringer dealer may can help you.
There is an entire crossover circuit inside that is BEFORE the amp section. There are 2 separate amps: one for HF and one for LF. Can you describe the noise you are hearing in more detail? Is hte sound effected by the gain controls at all? What happens without any input?
Proper level setting of the mixer is important. HOWEVER if the clipping is occuring at the speakers the only possible problem MIGHT be that you have a supersonic feedback that is saturating the speakers above your hearing range, Be sure you don't boost the highs too much with the EQ as this can cause the feedback that you can't hear. Also make sure that you power the speakers from the SAME receptacle as the mixer, even if it means running an extension cord to bring power to the mixer. This is to avoid a low frequency hum and common mode distortion/damage. A low frequency hum could cause the clipping.
It would be a good idea to get a sound meter to check the sound level. You should be able to reach 85 Db from this system without clipping. If you need more than that, you MAY need more speakers if the band instruments are too loud. Also if the band has amps that get into the vocal microphones that adds to the clipping level... make sure the mics don't "hear" the band instruments. Make sure your speakers are toward the audience from the mics to avoid the supersonic feedback problem. If the vocalists can't hear themselves with that configuration you need to set up seperate stage monitors.
There are some pretty good videos on YouTube about proper mixer level setup.
you can use the record outputs to run the signal into a stereo receiver without problems, though it would likely sound better with a shure sm57 microphone hooked up to a mixing board or other instrument amp.
the record output should be PERFECTLY balanced to hook up to a consumer-level stereo reciever with NO distortion; however, this record output might be too loud for another instrument amplifier or a mixing board; hence, the microphone in the latter situation.
There are some possibilities. One, your speaker may be blown or disconnected. Make sure the wiring is still connected to the speaker and if you have one, try measuring the resistance(impedance) of the speaker with a volt ohm meter.Do this unplugged from current and disconnect one of the wires from the speaker or you will get a reading from the output stage. Two if there is a heaphone or line out jack it may have become faulty. If you have sound with the headphones plugged in your amp is still producing sound. Some jacks are designed to interrupt the signal to the speakers allowing you to practice without bothering anyone. If your amp has that feature and you still have sound with the headphones and your speaker tests OK then your problem is the jack. Hope this helps.