A user reports that their desktop computer won't turn on. They mention that pressing the power button does nothing and there are no lights or sounds coming from the machine. As an IT technician, what is the FIRST step you should take to identify the problem?
Replace the computer's power supply unit immediately.
Open the computer case and reseat all internal components.
Check if the computer is plugged in and the power outlet is functioning.
Reinstall the operating system to rule out software issues.
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