How to Fix a Computer Screen That Turned Grey

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.
Check the display cable to make sure it is properly connected with the metal connector engulfing the display socket on the computer.
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.
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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How to Add Macbook Memory

Shut down and unplug your MacBook.
Open the computer case by loosening and removing the eight small screws around the edge of the computer back.
Discharge any static electricity in your body by touching a piece of metal. Static charges can damage sensitive components inside your MacBook.
Locate the memory card(s) toward the right side of the back of the computer.
Remove memory card by pressing the levers on either side of the memory card(s).
Install new memory card by inserting it at an angle into the memory slot the same way you removed the old card. Apply steady, even pressure and do not force the device into place. Repeat the same process for the second memory slot.
Close the computer case by snapping the bottom plate into the same position it was when you removed it. Replace the screws and tighten them firmly.
Plug in and start up your MacBook. It is ready to use with its new memory.
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