Well my new V4B and 112 cab came today! Opened the V4B box(double box, really great shipping design), pull out the head and immediately hear a rattle:roll no:,not a great sign. I look in the back and see a preamp tube cover rolling around. I think, wow, this box must have been dropped pretty hard to jar a spring loaded preamp tube cover. I take the back off and remove a power tube so I can get to the preamp tube, take it out and look at it and it appears to be ok. Put it back in and take the other preamp tube covers off and visually look at the other tubes. Everything looks ok. Plug the cab, guitar, and the power cord in and power it up. The red light comes on and everything looks good except, can't see any tubes lighting up. Take it off standby and the red light on front fades to off and all I get through the speaker is a low level hum. I turn everything off unplug it and check the fuse on the back panel, looks perfectly good. Try it one more time, same result. Before I take this head back to order a replacement, is there something simple I can try to fix the problem? I'm not electrically inclined and know just enough about tube amps to be dangerous. I suspect this head was dropped or thrown around pretty darn hard somewhere along the road. It looks cosmetically perfect. I'm afraid there is one or more areas damaged in the circuit during shipping. Any ideas??? Thanks for your help.