How To Check Psu [new] -

| Rail | Positive Pin (Red Probe) | Ground Pin (Black Probe) | Expected Voltage | |------|--------------------------|--------------------------|------------------| | +3.3V| Pin 1 (Orange) | Pin 3 (Black) | 3.30V ± 0.16V | | +5V | Pin 4 (Red) | Pin 5 (Black) | 5.00V ± 0.25V | | +12V1| Pin 10 (Yellow) | Pin 11 (Black) | 12.00V ± 0.60V | | +5VSB| Pin 9 (Purple) | Pin 7 (Black) | 5.00V ± 0.25V | | PS-ON| Pin 16 (Green) | Pin 15 (Black) | ~0V when PSU on |

To perform a more in-depth test, you'll need a multimeter:

Turn off the PSU switch and unplug the power cable. how to check psu

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

Software relies on the motherboard’s voltage regulators (VRMs) and sensors, which are not calibrated instruments. A reading of 11.8V might be accurate, or it might be a sensor offset of 0.2V. | Rail | Positive Pin (Red Probe) |

While the PSU is jumped (using the paperclip method), insert the black probe into a ground pin (black) and the red probe into the colored pins: Should be +12V Red: Should be +5V Orange: Should be +3.3V 3. Tolerance Levels

You can see real-time voltage readings in the "Monitor" or "Hardware Health" section of your BIOS. ⚠️ Warning Signs of a Failing PSU Tolerance Levels You can see real-time voltage readings

Before connecting testing tools, perform a visual and auditory inspection.