Turned my tv on today and only 1 speaker working (left front). Yesterday all speakers were working fine. Have unplugged everything and set up again but still just the one speaker working. Any ideas?

I am having the same problem with my Lifestyle 50 system. All analog sources only come out of 1 of 5 speakers, the left front. But digital sources over the coaxial input are in proper surround. Therefore I know all my speakers are working and the wiring is correct. I even went as far as replacing the entire Acoustimass 30 subwoofer unit with a known good used replacement. It has the same problem. So I don't have a full answer, but at this point I can guess that it's either an inherent problem with the sub, to the point that both mine and the replacement had the same issue. Or more realistically, the 8pin cable from M1 to Sub is to blame. Or it's the M1 unit itself. However we've had a professional bose repair shop repair and even replace our M1 unit in the last year, so I'm tempted to say it's not that. I'm still unsure what it is. I'm lost

Swop left & right speakers, if only the right speaker works, the ex left speaker is faulty, if the left side still doesn't work, the problem is the tv