Did you try a lens cleaner? If the lens is dirty/damaged then the DVD will not play. Use a branded lens cleaner(Sony is recommended). Just pop it into the drive and play it. It runs like a normal DVD except that the brushes will pop out of the cleaner disc and wipe the lens. You can get one on ebay for about 10-15 bucks.
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Did you try a lens cleaner? If the lens is dirty/damaged then the DVD will not play. Use a branded lens cleaner(Sony is recommended). Just pop it into the drive and play it. It runs like a normal DVD except that the brushes will pop out of the cleaner disc and wipe the lens. You can get one on ebay for about 10-15 bucks.