One other point: when I plug in the cables to the av20, the external processor and one of the amps comes on. The other amp does not.
I doubt that is a software problem. I would bet big money this is a hardware problem due to the electrical surge and the unit will need service.
It is worth repeating that local surge protectors are useless and a waste of money and space.
There is NO fool proof method of protection, but you can engineer a very large measure of protection.
The first thing to do it to bring your home cup to current National Electrical code specs, otherwise known as NEC.
This requires SPD-1 surge protection at electrical entry to the dwelling, and an SPD-2 surge protector at each electrical panel in the home. If you have one panel then one SPD-2 and one at each above that. I have 2 panels so have two SPD-2 surge protectors.
Make sure you purchase a reliable brand. Your electrician can install this and advise you on how to get your home to current NEC.
If you want to go further then you can also install an uninterruptible power supply at your equipment location, but do not connect power amps to these, but everything else. These switch to battery if power is unstable and give a soft shutdown for longer power outages.
I am at current NEC and also have uninterruptible power supplies to delicate equipment.
That is the best you can do, and it gives a very large measure of protection.
