I have a pair of REF600m, I took them out of my system for a month and when I hooked them back up one is dead. No green light, no music. Oddly there are no fuses or breakers in the amp ! Google shows that there are known problems with the power supplies going bad on these. I sent them both in to get looked at- they emailed me today that yup, one needs a new power supply- for $695- and they suggest doing the other one too as it'll probably go next. $1500 to repair two amps with known issues - and the amps are only worth $2800 if I were to sell them. Looking inside the amp there aint much hardware, $700 a power supply sure seems steep- and I'm really stuck. Don't fix them and they're useless, fix them and have a fortune sunk into a pair that aren't worth much. It's like I'd have to spend $1500 to make them saleable for $2500 just to dump them. I would have expected either a free replacement for a known problem or a low cost flat rate repair. I was expecting perhaps $350 each amp. Am I unreasonable? Ignoring the fact that I don't think they should have failed at all, ever. Signed: Unhappy and not buying anymore Bel Canto.