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?
Open the computer case and inspect the power supply unit (PSU) for any signs of damage.
Check if the power outlet and cables are functioning by using them with another device.
Replace the CMOS battery on the motherboard immediately.
Switch the voltage selector switch on the back of the power supply unit (PSU) and try again.
Checking the power outlet and power cables ensures that the computer is actually receiving AC 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 simplest, quickest, and least intrusive test to begin with before opening the computer to inspect internal components. Testing the outlet by plugging in a known-good device confirms whether the issue lies with the external power source or the computer itself. Inspecting the PSU, replacing the CMOS battery, or changing the voltage selector are more invasive steps that should be performed only after external power is verified.
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Why is it important to check the power outlet and cables first?
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What are the symptoms of a failing power supply unit (PSU)?
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How do you check if the CMOS battery needs to be replaced?