1 How do I replace dvd player
Apple repaired my dead MacBook Pro by replacing main logic board, battery and hard drive and updating to Snow Leopard, all for free. Now my dvd player doesn't show in System Profiler and I get "no valid DVD drive" message.
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2 
The drive must have worked for them to update to Snow Leopard but may have a loose connection. But I would take it back to Apple.
mayer さんによる