A client's desktop computer is not powering on at all when the power button is pressed. There are no sounds, no lights, and no fans spinning. Which of the following is the BEST first step to troubleshoot this issue?
Switch the voltage selector switch on the back of the power supply unit (PSU) and try again.
Check if the power outlet and cables are functioning by using them with another device.
Replace the CMOS battery on the motherboard immediately.
Open the computer case and inspect the power supply unit (PSU) for any signs of damage.
Checking the power outlet and power cables ensures that the computer is receiving power. If the outlet or cables are not functioning correctly, the computer will show no signs of power, which matches the symptoms presented. This is the most straightforward and non-invasive test to begin with before opening up the computer to check internal components. Testing with another device can confirm whether the issue is with the power source or the computer itself. While inspecting the PSU, CMOS battery, or voltage selector could potentially address the problem later on, at this point of troubleshooting, checking news of power from the outlet provides a more immediate understanding of where the problem may lie.
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What is a power supply unit (PSU) and why is it important for a computer?
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What steps can I take if the power outlet is suspected to be faulty?
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What is the role of the CMOS battery in a computer?