iMac 21.5" EMC 2638 Repairability Score: 2 out of 10 (10 is easiest to repair)

You can still replace the RAM and hard drive inside this machine...with a lot of adhesive cutting.

Budget-minded folks now can add a second hard drive to the base iMac because the Fusion Drive connector is no longer missing from the logic board.

The CPU is soldered to the logic board, and cannot be replaced or upgraded.

The glass and LCD are fused together, and there are no more magnets holding the glass in place.

Most replaceable components (like the RAM) are buried behind the logic board, meaning you'll have to take apart most of the iMac just to gain access to them.

You'll have to masterfully peel off the old double-sided sticky tape and apply new tape in order to reseal this iMac into original condition.