Well, unfortunately I'm not too familiar with the Mach 460 system. My initial guess would be that either the pre-amp inside the headunit is dead, or if you have an external amp pushing the back speakers, that your external amp is dead. The quote on fixing it seems a bit high to me however. I had the pre-amp go on my pioneer head unit several years ago and it cost me $300 (all out of pocket, no warranty). I'm not sure why he would have quoted you 1000 bones unless the 460 head unit is much more expensive than I imagined.
Try getting a couple different estimates on repairs just to be sure.
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