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.