Locate the .
Look for these symptoms that often point to a failing or underpowered PSU:
BIOS readings are rough – load fluctuates once in OS. how to check pc power supply
Disconnect all internal cables from motherboard, GPU, drives.
PC won't turn on, random shutdowns, burning smell. Locate the
| Symptom | Likely Issue | Check Method | |---------|--------------|---------------| | No power, no fan spin | Dead PSU | Paperclip test | | PC randomly reboots/shuts down | Voltage drop under load | Multimeter or swap test | | Burning smell, visible damage | Catastrophic failure | Visual inspection → replace | | Voltages in BIOS/HWiNFO look normal but PC unstable | Ripple or transient issue | PSU tester or swap test | | Fan spins but PC won't POST | Could be PSU or motherboard | Paperclip + multimeter on PG pin |
: To find your PSU's specifications, open the side panel and locate the PSU label for brand, model, and total wattage. PC won't turn on, random shutdowns, burning smell
Open the side panel of the case. Ensure the main motherboard cables are fully seated:
If the PSU fails any test, replace it immediately. Do not attempt to repair it. A failing PSU can destroy the motherboard, CPU, and graphics card. When replacing, choose a unit with an "80 Plus" certification and sufficient wattage for the system components.
