Hey I just got a Hartke 5500 a couple weeks ago and I was playing out of it yesterday and I lost all the sound. I turned it off and back on and nothing and the fan was not going on. I waited 10min or so powered it back up and the fan came on and I had sound back, Has this happened to anyone?. I am totally freaking out since I just got it. I don't know whats up it has not done it since but makes me uncomfortable I can't have that playing out live. It did not feel hot either. The amp has plenty of power and sounds decent although the tube pre amp seems rather week don't seem to warm up the tone that much. Any thoughts on this?