Check for Disconnected Monitor Power Cable Connections

by Tim Fisher
Tim Fisher has 30+ years' professional technology support experience. He writes troubleshooting content and is the General Manager of Lifewire.
Updated March 04, 2018

Power cables sometimes wiggle loose from monitors over time or after being moved around. Checking every point where electricity is delivered to the monitor is usually an early troubleshooting step when a monitor is blank.

01
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Check the Power Cable Behind the Monitor

Picture of a power cable and HDMI cable plugged into the back of a monitor
Power Cable Connection Behind Monitor. © Jon Fisher

The power cable connected to the monitor should fit firmly in the three-pronged port on the back of the monitor. This power cable is usually of the exact same type as the power cable to the computer case but may be a different color.

The monitor you see in this picture has an HDMI cable plugged in on the right; the power cable is located on the left in this picture.

Warning: Make sure you power off the monitor, using the power button on the front of the monitor, before securing the power cable into the back of the monitor. If the monitor is powered on and the other end of the power cable is plugged into a working outlet, you run the risk of electric shock.

Note: Some older styles of monitors have power cables that are "hard wired" directly to the monitor. These cables do not typically come loose. If you suspect an issue with this type of power connection, keep your personal safety in mind and do not service the monitor yourself.

Replace the monitor or seek help from a computer repair service.

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Verify Monitor Power Cables Are Securely Plugged In

Screenshot of several power cables plugged into a power strip
Power Cable Connections on Power Strip. © Jon Fisher

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

Make sure the power cable is securely plugged in.

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Verify Power Strip or Surge Protector Is Securely Plugged In a Wall Outlet

Picture of a power connection at a wall outlet
Power Cable Connection on Wall Outlet. © Jon Fisher

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

If your power cable is instead plugged into a surge protector, UPS, etc., ensure that particular device is securely plugged into the wall outlet.