My story so far..... I bought a used M9 and it was the best sounding amp I have ever heard. It died on a gig a few weeks after I bought it used and luckily the great store I bought it from (Long & McQuade in Oshawa, Canada) set things right and ordered me a brand new M9 from Mesa. Got my new Mesa a few months back and it has been perfect in every way..... Until tonight. Sooooo.... I plugged in tonight in my studio to practice and the amp wouldn't work. No sound at all but powered up. After playing around for a bit, powering down, unplugging, etc.... I found the problem. If I turned the compressor off, the amp worked fine. If I turned the compressor on and turned the ratio knob to 0, it also worked fine. As soon as the ratio knob was turned up a hair, the red compressor light came on and no output! Before I throw this @$&?%#! thing out the window, any ideas? I don't think it is a fuse issue, but..... HELP!!!!! I am really getting pissed as I just bought Mesa 410 and 115 cabs also..... Almost $3k invested in Mesa gear.... And the M9 is by far the flakiest head I have ever owned. Please tell me I am mental and the answer to my issue will make me feel like a moron! P.S. The Mesa in question was made on 7-7-11 and is S/N 1007.