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. 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.
Inspecting the Power Delivery Chain for Faults
Remove the RAM sticks and reseat them firmly in their slots. Next, inspect the power cable connecting the outlet to the back of the PC; a damaged cord is a frequent culprit.
This "minimal boot" approach helps isolate the problem. If you are using a surge protector or power strip, ensure its switch is turned on and that it is not damaged.
Inspecting the Power Cable and Connections
Motherboard And Internal Component Checks Assuming the PSU is delivering power, the issue often lies on the motherboard itself or with a short caused by internal components. If the system has discrete graphics, try removing the graphics card and connecting the monitor directly to the HDMI port on the motherboard to rule out a faulty GPU as the reason the pc wont switch on.
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