Definitely a newbie here. Bought a few machines for gameroom so grandkids can have some old fashion fun on pinball machines. I know most of you don't like the sound of HMM, but my wife and I actually do. Could possibly get old quick, but only had machines a few weeks. Brings back some fond memories from military days. Anyway, to get to the issue, all sounds played at first, but now, only some sounds play. No introduction sounds, and sometimes no sound at all. It started when the fourth ball was put in power amp rack (not sure of actual description) and the fifth ball would not load. A clicking noise from the back box, right wall continued until machine turned off. Fuse 15 found blown while back box open, replaced. Found 16 blown, replaced also. Probably had nothing to do with, just trying to give as much info as possible. Plays fine, except every now and then when ball put in power amp, new ball will not load. Really odd to be playing and machine goes completely quiet. Any help would be greatly appreciated and if I am on the wrong forum, please advise as to proper protocol and procedures. Thanks