Sony CDX-R3300 Not playing CDs

SOURCE: CDX-M8800 won't read CD-R discs

i was going to sugest switching brands of blank cdrs but you say ones that were working fine are now not ...so the problem is with the stereo not the cds.
 did you try a lens cleaner the eye may be dirty ..or possibly going bad.. Hey does it read regular bought disks ok???

SOURCE: Cd Player Lights Up No Music Coming Out Of Speakers

try resetting it, open faceplate, with pen tip ,press reset button

SOURCE: Cannot play my portable audio device with Sony cdx c500x

The multichanger has to be connected,with a cd in, but then the head unit will play whatever is fed to the bus in sockets. This effectively means the multichanger is playing to itself. If you want both to work, use a pair of piggy back rca leads into the head unit, one to the cd, one to the mp3. Then break into the cd leads and feed one of the pairs, one +ve, one -ve to a double pole switch so that you cut the sound from the cd allowing the mp3 in. To play cd's, flick the switch.

SOURCE: no sound from cd but stereo works no problem

there are 2 blue wires........dont hook the blue to blue!!!!!!!!!!!!!!!!!!!!!! hook blue to the blue/white wire!!!!!!!!!!! problem solved. so e-z huh? lol i did the same thing.

SOURCE: Sony CDX-727

yes is posible to be fix it but you need to take it to a repair shop request an stimet before they get it fix.