Thanks RickGr4 for your reply. Yes, I have tried all those codes along with any other I could find on the internet. I have spent so much time trying to resolve this, but nothing is working. Comcast even sent a different remote, and still no luck. The technician was here and couldn't find a code to work. I never realized how much we use the volume control until you have to climb a ladder to reach the volume control and turn the TV on and off. I wish I kept the old system; everything worked then. I tried the code from the old system, and that doesn't work either. I will keep trying until I find a code that works.
Any help is greatly appreciated. Have a Great Day!