Refurbished iMac 27" 3.4Ghz i7 256GB SSD

hey purchased refurbished imac 27" 3.4ghz i7 256gb ssd , planning upgrade 2tb , thought going pretty simple because have done ton of upgrades imac 27" 3.4ghz i7 1tb adding sad , replacing 1tb 2tb. refurbished imac 27" 256gb sad installed has different...

notice sort of jumper power management hdd... appreciated

 

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