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imac mid-2011

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    New SSD (restored from TimeMachine) not detected internally — but is detected externally

    Hello — hope to get some advice. I have a mid-2011 21.5 inch iMac running on High Sierra and I attempted to replace the HDD with a new 2TB Crucial SSD (CT2000MX500SSD1) but am experiencing a non-detection error — an alternating question mark folder icon with the Apple logo and a cross icon...
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