PACKARD BELL MH4000 - Manual (Page 121)

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Upgrades and Options
Installing a Power Supply Module
1. Before installing the power supply module pull the
release-handle down.
2. Slide the new or replacement power supply module
into the chassis until the power supply module
release-handle is almost closed (upright position).
3. Push the power supply module release-handle up
and in until the power supply module slides in
further and locks in place.
4. If removed, connect the AC power cord to the back of
the power supply cage.
5. If OFF, set the main AC power switch to its ON
position. The main AC power switch is located at the
top of the power supply cage.