If your computer powers on briefly but fails to complete the boot process, or if peripherals like fans or RGB lighting behave erratically, the PSU is a prime suspect. The power supply unit (PSU) is the foundation of your PC's electrical system, converting wall outlet current into the stable, clean voltages required by your motherboard, CPU, and graphics card.
Confirming Power Supply Function: Testing Your PC PSU's Performance
Use an online PSU calculator or manually add the Thermal Design Power (TDP) of your CPU and GPU, then add 100-150 watts for the rest of the system. Start by examining the exterior of the PSU for any visible bulging or leaking capacitors, which appear as raised, cylindrical bumps on the circuit board.
When you check the power supply on my PC, you are not just looking for a simple on or off status, but rather whether it can consistently deliver the correct voltage under the specific demands of your current workload. Bent or damaged pins on the motherboard or graphics card power connectors can prevent proper contact, mimicking a dead system.
Testing PSU Functionality to Confirm Power Supply is Working
3V, +5V, and +12V rails should each hold within roughly 5% of their nominal value. If your calculated draw is close to or exceeds the PSU's rated capacity, the unit is likely the source of your problems.
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