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When a unit does that it can be a fingerprints on a disc not letting it read the disc and or also that it is not finalized. Can also be a disc format that does not work on unit. Some units only work with either -R or +R and not both. Hope this helps
In the manual there is a list of discs the unit wil play. On the last pages there is a quick reference. There are also region codes that need to be set. Maybe a power outage reset your settings. Also it would be good to know if this unit played disc previously, plays other disks? Or the discs play on other players. It could just be a dirt problem as well.
I also have this annoying problem - but I bought mine new on ebay and have zero after-sales support. I have tried all the hacks I cna find over the last 12 months and when I am finished, the messages all say 'congratulations, you're now region free'. But even the local DVDs don't work. Disc ejects itself with irritating message 'unknown disc'. Does anyone have this problem who has a SALES RECEIPT from an authorised LG dealer? If so, can you jump up and down with LG until they offer a solution? Thanks!