Acer Altos G530 - Manual (Page 85)

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Installing a non-redundant power supply module
The Altos G530 power subsystem accepts a 600-watt non-redundant
power supply module. If you are replacing a previously installed power
supply module, turn it off and unplug it.
1 Observe the ESD precautions and pre-installation instructions
described on page 35.
2 Detach the power and power supply cable from their connectors.
3 Remove the four screws on the cover of the power supply module
bay, then detach the cover.
4 Slide the power supply module toward the front of the system,
then lift the power supply module out of the chassis.