Just took delivery of my GK 700RB-II w/210SBX/115SBX cabinets. Upon hooking it up I notice two things that I am immediately concerned about: 1. Loud buzzing noise coming from the amp. Seems to have something to do with my bass (2004 Carvin LB70) because the intensity of the buzzing seems to fluctuate as I move around. It's seems loudest and almost untolerable when I'm standing near the rig trying to make adjustments. I tried the ground lift, no dice. Is this common? Is there something wrong with the amp? I never had this problem with my other rig. 2. The fan does not start upon power up. I know it's a variable speed fan, but shouldn't it start right away when the amp is turned on? I didn't have a chance to keep the amp on long enough to see if it would eventually start? Is this normal? Does the fan eventually come on when the amp reaches a certain temperature or does the 700RB-II need to be returned?