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Edit by Simon Howes:

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[* icon_note] In the next few steps, we remove many components that are very similar to the last 21.5" iMac.
[* black] The [http://www.wdc.com/en/products/products.aspx?id=110|WD Caviar Blue] hard drive is held to the front bezel by a few screws and, as always, the SATA data/power connectors.
[* black] The WD Caviar Blue drive is a none standard SATA drive. The power connector features 7 pins, rather than the standard 4. The drive also has none standard firmware. This means you can only use Apple's own hard drives and not any standard after-market SATA ones.
[* black] Removing the power supply requires disconnecting the AC inlet cable from the logic board.
[* black] The LED driver board comes out next after successfully removing the power supply.