Here are steps to follow if your in-dash CD or MP3 player will not play discs or if they skip.
1) First of all, ensure that your discs are clean and not damaged and have been inserted into the in-dash player the correct way up.
Try other discs, especially original CD's, to see if they will play.
This is especially necessary if you are using CD-R or CD/RW (copied discs).
The problem could arise if a cheap CD-R is used.
It could also arise if a disc is burned at too fast a speed or if the copier hadn't finalized the disc completely.
2) Use a CD laser cleaner disc.
These are available from any music store.
When these are played in your CD player, they will clean the laser.
This will take care of problems related to a dirty CD laser: Discs not playing or playing but skipping.
3) Ensure that the fascia contacts/connections aren't worn and that the fascia is making good, solid contact.
Because the fascia is removable, over time, the contacts can become dirty or worn.
To find out how to clean your contacts, consult your radio handbook.
4) Press the 'Reset' buttonif your radio has one, and then check for correct operation.
Consult your radio hand book for details.
5) If your radio doesn't have a 'Reset' button, release your radio from your dash and physically disconnect the power connector and then reconnect and test for correct operation.
If the problem is still present after following the above, please, consult a car audio expert.