新 iMac のバラシの難易度は 7/10：iFixit

［吸着盤を使って開ける］

iMac Intel 21.5″ EMC 2428 Teardown | iFixit

iMac 21.5″ EMC 2428 Repairability Score: 7 out of 10 (10 is easiest to repair)

- The front glass panel and LCD are quite easy to remove for accessing all the hardware underneath.

- RAM, hard drive, and optical drive can be replaced with relative ease, as long as you don’t mind taking out the LCD (for the drives).

- Limited use of adhesives (pretty much all the fasteners are mechanical) make disassembly pretty straightforward.

- Replacing the CPU and GPU is possible to do, but you need to remove the logic board from the computer.

- Removing the logic board is a pain, since you have to disconnect a bunch of connectors, and wiggle it out of the machine.

- Making the LCD and glass spotless when reassembling the machine is nearly impossible.