You are assigned to replace the RAM modules on a user's workstation. Before starting the repair, what is the most important step to ensure safety?
Disconnect the network cable
Enable safe-mode on the PC
Disconnect the main power supply
Perform a reboot
Before replacing the RAM modules on a user's workstation, the most important step to ensure safety is to disconnect the main power supply. This involves fully shutting down the computer and unplugging it from the wall outlet. Simply turning off the computer with the power button is not sufficient, as residual power may still be present in the motherboard. Disconnecting the power supply helps prevent electric shock and protects the internal components from damage. Other actions, such as enabling safe mode, disconnecting the network cable, or performing a reboot, do not contribute to safety during hardware replacement and are therefore not appropriate in this context.
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