PSUs fail over time, often due to electrical surges or simply old age. A silent room, a dark monitor, and the absence of any familiar startup sound can trigger immediate panic about lost data or a costly repair.
Surge Protector Switch: Why Your PC Won't Turn On and How to Fix It
If the PC starts successfully with only the mouse and monitor connected, you can reconnect devices one by one to identify the culprit causing the shutdown. Check the back of the case for any lights; if the power supply fan is not spinning and the hard drive activity light is dead, the machine is not receiving power.
However, the most reliable method is to swap in a known-good PSU from another working system. If you are using a surge protector or power strip, ensure its switch is turned on and that it is not damaged.
Surge Protector Switch Causes PC Won't Turn On
Additionally, check for any obvious signs of damage, such as burnt capacitors or a swollen battery. Remove the RAM sticks and reseat them firmly in their slots.
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