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Optical drive IF173-066-1 makes eject sound every 75s when sleeping

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I replaced the optical drive in my iMac 2428 with the replacement part sold on iFixit.  When the computer is asleep, the drive actuates like it is ejecting a disc every 75 seconds.  Have already reset PRAM and SMC.

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iMac Intel 21.5" EMC 2428

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