I just recently came into possesion of a MAG300H and it's a pretty good amp for practice and as a back up. I like the sound and the weight (compared to my 85 lb SVT-CL) but I'm finding the cooling fan never comes on even after a few hours. I've emailed Ashdown over a week ago and have gotten no response. I swapped out the fan and the same thing. Anyone else run into this problem??