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Hello, If the disc does not spin it will cause the optical reader to not read the disc, which will give you the "no disc" or "invalid disc" error. If a disc will not spin, the most common cause of this is due to a spindle motor malfunction. The good news is that it can be fixed on average of between $70-90 dollars depending on what service repair technicians charge in your local area. You can fix the problem yourself if you have the patience and a bit of knowledge, but I can tell you from first hand experience it is a pain to do this.
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Did you make the disk if you made the disk your computer has to give it a digital signature so the DVD player can read it if you're using a regular DVD then I would very carefully using rubbing alcohol and Q tip clean the actual laser I would be very careful doing this if too much rubbing alcohol is on the Q tip it will ruin the laser you can also try resetting the DVD player by taking out the battery and unplugging it from any power source and leave it that way for at least 20 seconds to a minute if that doesn't work you might have something else wrong
If the lens is clean (clean with cotton swab and alcohol), then the optics are failing. DVDs require more power and accuracy to be read than CDs. The ability to read CDs but not DVDs is usually a good indication that the optics are starting to fail.
Check and see if there is dust or dirt or something on the lens. Dirt, grease and fingerprints will cause a DVD player to have read errors. If it a new player, or under warranty, get it replaced. It sounds like it is failing.
I work for Coby technical support. Our customer service phone number is 1-800-727-3592.
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the unit is showing "invalid disk" on every disk that you try to play,
unfortunately, the unit has developed a defect and needs to be
replaced. It can not be repaired. Our warranty is 90 days from the date
of purchase. If you received the unit as a Xmas present, please call
the number above for instructions on getting the unit exchanged.
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