Checking your PC's power supply unit (PSU) is a critical troubleshooting step when your computer suffers from random shutdowns, freezes, or fails to turn on at all. Because Windows does not have a native sensor to report the exact health of a PSU, you must use a combination of physical inspection, software monitoring, and manual testing to diagnose issues. 1. Identify Signs of a Failing Power Supply
Frequent system crashes or "memory-type" errors can be caused by unstable voltage delivery. check power supply pc
The most definitive test for the home user is the "paperclip test" or the use of a dedicated PSU tester. To perform the paperclip test, the PSU must be completely disconnected from the motherboard, drives, and peripherals. After shorting the green "Power On" (PS_ON) wire to any adjacent black (COM) ground wire on the 24-pin motherboard connector using a bent paperclip, the user plugs in the PSU and flips its switch. A functional unit will cause its internal fan to spin. However, this test is a binary check—it only confirms the PSU is not dead. It cannot measure voltage stability, ripple, or wattage output. A PSU that passes the paperclip test can still fail under load. Checking your PC's power supply unit (PSU) is
Before delving into hardware, a safe and methodical approach begins with software and observation. Users should first eliminate simple software causes by checking the Windows Event Viewer for critical Kernel-Power errors (Event ID 41), which indicate the system rebooted without cleanly shutting down. While this confirms a power anomaly, it does not condemn the PSU alone; a failing motherboard or overclocking instability can mimic the same error. The true diagnostic value here is corroboration: if these errors coincide with periods of high power draw (gaming, rendering), the PSU becomes the prime suspect. Identify Signs of a Failing Power Supply Frequent
Ultimately, checking a power supply is an exercise in holistic diagnosis. If a PSU fails any physical inspection, the paperclip test, or the multimeter check, it must be replaced. Even if it passes all tests but the system continues to exhibit classic power-failure symptoms, it is often prudent to swap the PSU with a known-good spare. Due to the PSU’s role as the gateway for all electricity, a failing unit does not merely stop working; it can catastrophically fail, sending a surge of voltage through the motherboard, CPU, and storage drives, destroying them instantly.