You are called to look at a coworker's computer. It will not power on: no fans spin, no sounds are heard, and no lights illuminate when the power button is pressed. What should you do first?
Because the PC shows absolutely no sign of life, start with the simplest possibility: ensure that power is actually reaching the system. Verify that the AC power cable is firmly connected to both the wall outlet (or power strip) and the computer's power supply. Only after ruling out an unplugged or failed cable would you proceed to more involved steps such as testing or replacing the power supply. A bad CMOS battery or an incorrect boot order would produce different symptoms-and you cannot access the BIOS/UEFI without power.
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Why is checking the power cable the first step in troubleshooting a non-powering computer?
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What are the indications that a power supply might be faulty?
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What are other common troubleshooting steps if checking the power cable does not resolve the issue?