A desktop PC in a graphic design studio unexpectedly shuts down and refuses to power on normally following a localized electrical surge. When the technician presses the chassis power button, the power supply unit (PSU) fan spins for a fraction of a second and immediately shuts off with an audible click. The system will not attempt to spin up again on subsequent button presses until the AC power cord is unplugged and reinserted. Which TWO of the following diagnostic steps should the technician take to isolate the root cause? (Select TWO.)
- Test the PSU output voltages with a dedicated power supply tester to check if internal over-current or short-circuit protection is latching.Cevap
- Disconnect all non-essential component power cables and expansion cards to determine if a short circuit on a peripheral rail is tripping the power supply.Cevap
- CFlash or physically replace the motherboard BIOS/UEFI EEPROM chip to fix corrupted boot initialization logic.
- DReplace the system memory modules with SO-DIMM form-factor RAM to lower overall memory bus power consumption.
Cevap
The technician should test the power supply with a dedicated PSU tester to check for protective circuit latching, and disconnect non-essential components and expansion cards to verify if a short circuit on a peripheral rail is causing the PSU to trip.
When a power supply momentarily activates and immediately shuts down until AC power is toggled, its internal short-circuit or over-current protection circuit has been tripped. To troubleshoot this state, the technician must test the PSU directly with a power tester or multimeter and perform component isolation by removing non-essential power cables and expansion cards to identify any short-circuited component rail.
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PSU Protective Latching and Component Short-Circuit Isolation