Monitors malfunction for numerous reasons. When a monitor turns grey, it might indicate an incorrectly connected display cable or a faulty graphics card. Before assuming assume your graphics card might be the problem, however, check the monitor. Several interactions from the computer to the monitor take place to display a single image—and any one of these interactions could be faulty.
Step 1
Look at the back of your monitor just below the socket for a voltage selector. Set the voltage appropriate to your country, if it isn't in the correct position already. For a monitor in USA, the voltage is 115 volts.
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Step 2
Check the display cable to make sure it is properly connected with the metal connector engulfing the display socket on the computer.
Step 3
Disconnect the monitor's display cable and look at its pins. If any of them appear bent, straighten them out by disconnecting the power cable from your monitor and sticking a thin metal object next to the pin and levering the pin until it appears straight again.
Step 4
Adjust the brightness and contrast knobs on the monitor. The settings may have been at minimum or maximum; adjusting the knobs will help return the settings back to an optimal position.
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