20 Most Recent Sony CDX-M610 CD Player Questions & Answers

Here is a link to the Owners Manual for Sony CDX-M610. Look on page 8 for reset proceedure after battery replacement.
http://www.docs.sony.com/release/CDXM610.PDF
Should be same for your situation.

Have you tried resetting the unit? Remove faceplate and push the reset button with a ball point pen. If it's a bluetooth model there is a different procedure. Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/mark_b53a7494531bf96d

THE CDX-M610 LIKE ALL OF THE CDX-M630, M800, M850MP SHOULD ALL SIMPLY START TO PLAY THE CD WHEN INSERTED. BECAUSE YOU ARE ABLE TO TUNE RADIO STATIONS AND HEAR THEM PLAY SHOWS THAT YOU HAVE EVERYTHING IN PLACE AND ARE DOING EVERYTHING RIGHT. SO IF IT IS NOT PLAYING, THEN IT WILL NEED TO BE SERVICED. AS FOR THE REMOTE, IT IS NOT REQUIRED OF ANY OF THE CD PLAYERS IN ORDER TO PLAY CD OR TUNE RADIO STATIONS. RATHER THAN INVEST IN REPAIRING, I WOULD LOOK FOR ANOTHER MODEL ON EBAY USED AS IT WILL PROBABLY GO PRETTY CHEAP. ALSO HAVE CHANCE TO GET A HIGHER MODEL LIKE THE ONES I MENTIONED ABOVE. I HAVE SEVERAL OF EACH IN MY COLLECTION AND THERE ARE NICE PLAYERS. OK. HOPE THIS HELPS.....V

lcd reader on face plate is bad

Attach power wire to positive side and ground wire to the negative of your car battery it would power up then eject cd, be careful when doing this don't touch any of the other wires to the battery. Might have to add longer wire to the power and ground wire.

Try checking all of the fuses in your vehicle. There is probably a fuse behind the radio also.

THERE IS A CODE ON YELLOW PAGE IN INSTRUCTIONS