A user reports that a desktop computer will not power on. You have already confirmed that the power cable is firmly connected to both the computer and a known-working wall outlet. According to the troubleshooting methodology, what is the NEXT most obvious question to ask?
Are there any error messages on the screen?
Is the operating system fully up to date?
Did you recently install any new software?
Is the power supply's rear switch set to the On (I) position?
The correct answer is "Is the power supply's rear switch set to the On (I) position?" Even after confirming that power is reaching the outlet and the cable is seated, the computer's own power supply can still block power if its rocker switch is in the 0 (Off) position. Checking that switch is therefore the logical next step before opening the case or considering software or firmware issues. Questions about on-screen errors, software installation, or operating-system updates assume the computer can already start, which it currently cannot.
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How do I check if a power outlet is functioning?
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