In the next few steps, we remove many components that are very similar to the last 21.5" iMac.

The WD Caviar Blue hard drive is held to the front bezel by a few screws and, as always, the SATA data/power connectors.

The WD Caviar Blue drive is a non-standard SATA drive. The power connector features 7 pins, rather than the standard 4. The drive also has non-standard firmware. This means you can only use Apple's own hard drives and not any standard after-market SATA drive.

Removing the power supply requires disconnecting the AC inlet cable from the logic board.

The LED driver board comes out next after successfully removing the power supply.