220-802 Question #359: Real Exam Question with Answer & Explanation

The correct answer is D: Power supply tester. A computer that fails to power on after a thunderstorm most likely suffered a power surge that damaged the power supply unit. A power supply tester is the appropriate tool to verify whether the PSU is delivering correct voltages.

Question

A technician is troubleshooting a customer's computer that will not turn on. The user stated that the computer was working fine until there was a thunderstorm the other night. Which of the following tools would the technician use to determine what is wrong with the computer?

Options

AFactory diagnostic CD
BPOST card
CToner probe
DPower supply tester

Explanation

A computer that fails to power on after a thunderstorm most likely suffered a power surge that damaged the power supply unit. A power supply tester is the appropriate tool to verify whether the PSU is delivering correct voltages.

Common mistakes.

A. A factory diagnostic CD requires the computer to successfully boot to at least a BIOS/UEFI level to read optical media, which is impossible if the system will not power on at all.
B. A POST card diagnoses errors that occur during the Power-On Self Test sequence, but the computer must first receive power and begin the boot process before a POST card is useful.
C. A toner probe is a network cabling tool used to trace and identify cable runs and has no application in diagnosing computer power or hardware failures.

Concept tested. Diagnosing power supply failure after electrical surge

Reference. https://learn.microsoft.com/en-us/troubleshoot/windows-client/performance/troubleshoot-computer-hardware-issues

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