The laser pickup is not reading the disc, causes! bad pladder motor, laser pickup at end of life. Only option is to replace the entire assembly which would not be cost effective to repair, far cheaper to replace.
SOURCE: My denon udcm m7 personal component system cd
This was addressed in http://www.fixya.com/support/t557928-denon_udcm_m7_cd_player_often_reads_err
SOURCE: sony system shows "initialising"
probably your laser is weak,if you're not qualified to open pls, visit nearest sony service center to have the laser replaced.
SOURCE: No disc appears even though a disc is in it - correct side up
Either the CD player does not support the format of the CD or the reading lens insidemight be covered with dust. Use a CD lens cleaner to rectify this problem.
SOURCE: Hello, I have a Sony Mini
Since this problem occurs on various disks try using a cd/dvd cleaner set, a wet one is better. Follow the instructions on the set. The main idea is to put one drip of the included liquid at the set (usually isopropyl alcohol) at a specific place (like small brush) on the disk surface and play this disk. This way the "brush" will clean up the laser lens and after that the cd player will be able to read the disks. BE CAREFULL not to put too much liquid on the "brush". In case you can, use a Q-tip with isopropyl alcohol to clean up the cd lens manually. In case this doesn't solve your problem, the cd player needs laser lens replacement by a technician.
In case of a problem or clarification, don't hesitate to post me a reply before rejecting my answer.
If you are satisfied, accept my solution.
Thanks and regards
Stelios
direct FixYa link: http://www.fixya.com/users/technical114
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