How To Check Psu [upd]

A bootable operating system, software (HWMonitor, HWiNFO64, or OCCT).

This is the gold standard. Look for the "Sensors" section and scroll down to your motherboard voltages. how to check psu

Quick, visual pass/fail testing for multiple rails simultaneously. A bootable operating system

If a PSU is more than 5–7 years old, exhibits any out-of-tolerance voltage, or causes unexplained system instability, replace it. A high-quality PSU is the cheapest insurance for the entire computer system. exhibits any out-of-tolerance voltage

Is your PC , or is it crashing during use ? Do you own a multimeter or a dedicated tester ? What model of PSU are you currently using?

Determines if the PSU can power on at all. It does not test voltage accuracy or ripple.