220-802 · Question #359
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…
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
How the community answered
(24 responses)- A4% (1)
- B8% (2)
- D88% (21)
Why each option
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.
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.
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.
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.
A power supply tester directly measures the output voltages on each rail of the PSU (such as +3.3V, +5V, +12V) to determine whether the unit is functioning correctly after a potential surge event. Because the computer shows no signs of life - not even POST - the failure point is most likely the power supply, which is the first component in the power chain. A power supply tester can confirm this diagnosis quickly without requiring a full system teardown.
Concept tested: Diagnosing power supply failure after electrical surge
Source: https://learn.microsoft.com/en-us/troubleshoot/windows-client/performance/troubleshoot-computer-hardware-issues
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