ok so i posted the mesa i bought a few days ago with problems i had with it and so on. so i back to the store today and returned it and bought.... i think it sounded great at the store through the same head i have and another rick (tuned higher). so i get it home and fit it nicely into my civic (thank god haha) after spending an arm and a leg only to encounter a new problem i pull in all my stuff ready to jam by myself before work and i turn it on and NOTHING! i'm pretty sure i blew my head at the last band practice. when i turned it on that day it had like a destortion noise for a second and quickly turned it off, scared. i turned it back on a few minutes later and everything seemed ok. when i got home today and turned it on the same thing happened, distortion sound from a guitar amp, like buzz, but super loud... after a few moments the got nasty feedback and shut off... i let it sit for 4 hour while at work, only to come home to the same problem. i tryed switching cables, everything, turning on and off, different bass and everything.. is there anything i can do to fix it or am i doomed to return my cabinets AGAIN and get lesser cabs and a new head? please help thanks.