A paperclip or a small piece of wire.
The Power Supply Unit (PSU) is the foundation of computer system stability. A failing PSU often manifests as ambiguous symptoms—random reboots, failure to post, or graphical artifacts—which are frequently misdiagnosed as RAM or motherboard failures. This paper outlines standardized methodologies for testing a PSU, ranging from software-based monitoring to hardware-specific testing using multimeters and paperclip testing. how to check my psu
Before initiating physical testing, the user must recognize the clinical symptoms of power instability. Unlike other components, a PSU may function "partially," delivering enough power to light LEDs but insufficient voltage to maintain system stability. A paperclip or a small piece of wire
| Rail Color | Nominal Voltage | Acceptable Range (±5%) | Probe Target | | :--- | :--- | :--- | :--- | | | +3.3V | 3.135V – 3.465V | Connect to Orange wire pin | | Red | +5V | 4.75V – 5.25V | Connect to Red wire pin | | Yellow | +12V | 11.40V – 12.60V | Connect to Yellow wire pin | This paper outlines standardized methodologies for testing a