Check for Disconnected Computer Power Cable Connections

Power cables often wiggle loose from PC cases over time or sometimes after being moved around. Checking every point where electricity is delivered to the computer system is usually a first step when a computer isn't receiving power.

The first place to start is with the power cable that connects at the rear of the computer case. The power cable should fit firmly in the three-pronged port on the power supply.

Follow the power cable from the back of the computer case to the wall outlet, surge protector or power strip that it is (or should be) plugged in to.

Make sure the power cable is securely plugged in.

If the power cable from the PC case was plugged into the wall outlet in the last step, your verification is already complete.

If your power cable is plugged into a surge protector or a power strip, ensure that it is securely plugged into the wall outlet.