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Trying to find replacement parts for your model could be a task. LCDs are so inexpensive these days it would be cheaper to just replace it. Not sure if you have a Frys computer store nearby but I saw a 22" LCD for 129.00. Check your local electronics stores also. If you did find the part for your Gateway consider the cost and installation fees.
It appears that the display resolution set in your display properties is out of the range that the LCD can display.
Boot to the ENABLE VGA MODE by pressing F8 to get the Windows Boot Menu. If you can get to the desktop, then go to display properties, and see if you can change the resolution to higher settings and maintain video. (If the video blanks out, then it should revert to the previous setting in 15 seconds)