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optical drive on iMac Sierra 10.12.6 ejecting cds

My iMac is Sierra 10.12.6

Processor 2.9 GHz Intel Core i5

Memory 8BG 1600 MHz DDR3

Graphics NVIDIA GeForce GTX 660M 512 MB

The optical drive rejects cd's & DVD's & makes a terrible noise before doing so.

It has been working fine until now.

Please help.

最后更新：2017-09-06 13:54:24

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