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Removing the power supply - for some PC cases, this is a must-do. To do so, first remove the screws.
While the screws are being removed, the power supply has to be supported so that it doesn't fall into the case and wreck the other components.
Our PC system without boards or power supply.
Now the wires (hard drive, CD-ROM, DVD drive, CD burner) are to be removed from the motherboard.