You are called to look at a co-workers computer. It is not powering on, no fans start, there is no sound, and no lights turn on when the power button is pushed. What should you do first?
Replace the power supply
Replace the CMOS battery
Check the power cable
Check the boot sequence in the BIOS/UEFI
Checking the power cable is the most logical answer. You do not know if the power supply is good yet, so replacing it would be premature. These symptoms are not indicative of a CMOS battery issue or a boot sequence issue (also, you can't access the BIOS/UEFI if there is no power).
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