A technician is troubleshooting a desktop computer that turns off immediately after being turned on. What is the correct sequence of steps the technician should follow to diagnose and resolve a suspected power supply issue according to standard troubleshooting procedures?
- 1Verify that the external power cable is securely connected to a known-working wall outlet and the power supply rocker switch is turned on.
- 2Check that internal motherboard power connectors, including the 24-pin ATX and 8-pin EPS power cables, are firmly seated.
- 3Measure the power supply voltage outputs using a dedicated PSU tester or multimeter.
- 4Replace the defective power supply unit with a functional, known-good replacement unit.
Answer
The correct sequence begins with verifying external power, checking internal motherboard cable seating, testing PSU rail voltages with a dedicated tester, and finally replacing the faulty power supply unit.
CompTIA troubleshooting methodology requires prioritizing simple external verifications before inspecting internal connections, taking tool-based measurements, and performing component replacement.
Step-by-Step Solution
Key Concept
Power Supply Diagnostics and Isolation Sequence