<font color='#000000'>Scott67,
I don't know if you have figured the problem ouy since you posted this question. The problem is the newer RB-1090 need a 20amp circuit to work. I went through this same thing about 18 months ago. The newer 1090s have a larger power supply than the original 1090s that worked fine on a 15 amp circuit. I had to have a friend help run a 20 amp line and put a 20 amp circuit breaker in the breaker box. I have since gotten rid of my Rotels for other reasons and went to Bryston amps.
Hope this helps if you have not already figured the problem out.
Andy</font>