Replace your iMac's SD card reader with this OEM Apple SD Card Reader Board for the 21.5\" iMac A1311 (820-3038-A). Used but fully tested and working. Board only--no cables or housing. Compatible with iMac10,1 (Late 2009), iMac11,2 (Mid 2010), iMac12,1 (Mid 2011); Apple part numbers 820-3038-A and 593-1281; EMC 2308/2389/2428.
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