Old Organ Won't Power On?

That's something that definitely needs to be looked at by a professional. It could be a bad connection, that you can't see, while the chord may look fine, from what you can see, the problem could be somewhere else. Have someone from a shop that repair electric organs look at it. This is not something that the average person should be trying to fix.By doing so you could do more damage, and make the costs more to have a professional repair it. Also there is the possibility of residual electric being held in the organ, and putting your hand in the wrong place could get a bad shock, or even be lethal.