Which of the following is a basic first-step diagnostic when a computer will not turn on?

Which of the following is a basic first-step diagnostic when a computer will not turn on?

• A. Reinstall the operating system.
• B. Replace the motherboard.
• C. Update the BIOS to fix boot issues.
• D. Check power connections, ensure the power source works, and listen for fans or LEDs.

Answer: (D)

When a computer won’t turn on, the first thing to check is power delivery. Make sure the power cord is firmly connected to both the computer and a known-good outlet or power strip, and look for any signs the system is getting power, such as fans starting to spin or LEDs lighting up. This step is essential because if the machine isn’t receiving power, nothing else—like software repairs or component swaps—will resolve the issue. If there are no signs of life, you can focus on power-related fixes first, such as testing a different outlet or power cord and ensuring internal power connections are seated properly. Reinstalling the operating system assumes the machine can boot, which isn’t the case when there are power issues. Replacing the motherboard or updating the BIOS are advanced steps that should come after confirming the device can power up and reach a basic startup state. Observing fans or LEDs indicates at least part of the power path is working, guiding you to the next steps in diagnosing and restoring normal boot.

When a computer won’t turn on, the first thing to check is power delivery. Make sure the power cord is firmly connected to both the computer and a known-good outlet or power strip, and look for any signs the system is getting power, such as fans starting to spin or LEDs lighting up. This step is essential because if the machine isn’t receiving power, nothing else—like software repairs or component swaps—will resolve the issue. If there are no signs of life, you can focus on power-related fixes first, such as testing a different outlet or power cord and ensuring internal power connections are seated properly. Reinstalling the operating system assumes the machine can boot, which isn’t the case when there are power issues. Replacing the motherboard or updating the BIOS are advanced steps that should come after confirming the device can power up and reach a basic startup state. Observing fans or LEDs indicates at least part of the power path is working, guiding you to the next steps in diagnosing and restoring normal boot.