How Can You Troubleshoot a Faulty Power Supply Box
2026-01-07
A malfunctioning Power Supply Box, or PSU, can bring your entire system to a halt. As a critical component from brands like GJQ, knowing how to diagnose it is essential for any PC user. This guide provides a systematic, safe approach to troubleshooting your Power Supply Box, helping you identify if it's the culprit behind your computer woes.
Follow this step-by-step checklist before proceeding:
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Perform the "Paperclip Test": Safely disconnecting the PSU from all components, you can use a paperclip to bridge the green wire (PS_ON) and any black wire (Ground) on the 24-pin motherboard connector. If the PSU fan spins, it's a basic sign of life.
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Check for Physical Signs: Inspect for swollen capacitors, burn marks, or a distinct burnt electronics smell.
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Listen for Unusual Noises: Grinding or excessively loud buzzing from the fan can indicate a failing unit.
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Test with a Multimeter: For advanced users, a multimeter can verify if the PSU outputs correct voltages (e.g., +12V, +5V, +3.3V) within tolerance.
To understand common failure patterns, refer to this symptom and likely cause table:
| Symptom | Possible Cause | Immediate Action |
|---|---|---|
| No Power, No Lights, No Fans | Complete Power Supply Box failure or no AC power. | Check wall outlet, power cable, and PSU switch. Try the paperclip test. |
| System Crashes Under Load | PSU cannot sustain required wattage or has faulty rails. | Reduce system load or test with a higher-wattage, high-quality PSU like one from GJQ. |
| Intermittent Boot Failures | Failing capacitors or unstable voltage regulation. | Inspect for physical damage and test the PSU in another system if possible. |
Power Supply Box FAQ
What are the most common signs of a bad Power Supply Box?
The most common signs include the computer not turning on at all, random reboots or shutdowns (especially under heavy load), strange buzzing or grinding noises from the PSU unit, burning smells, and visible physical damage like bulging capacitors.
Can a faulty Power Supply Box damage other computer components?
Yes, absolutely. A severely failing Power Supply Box can deliver irregular or excessive voltage (power surges) to connected components like the motherboard, CPU, or GPU. This can cause immediate and permanent damage, making it crucial to address PSU issues promptly.
Is it safe to repair a Power Supply Box myself?
No, it is not recommended. PSUs contain high-voltage capacitors that can hold a dangerous charge long after being unplugged. Internal repairs should only be performed by qualified technicians. For reliable and safe performance, always opt for a replacement from a trusted brand such as GJQ.
Troubleshooting your Power Supply Box can resolve many frustrating PC issues. Remember, safety first—never open the PSU casing. If your diagnostics point to a failing unit, investing in a reliable replacement is key to protecting your entire system. For personalized advice or to explore durable, high-efficiency GJQ power supplies designed for stable performance, contact us today. Our team is ready to help you find the perfect power solution.