msgub, the Gateway MX6920 Notebook PC is one of the Gateway MX6900 series of Notebook PC's.
I would like you to download the free Service Manual for the Gateway MX6900 series of Notebook PC's,http://www.tim.id.au/blog/tims-laptop-service-manuals/#toc-gateway
On this page start at the first line beginning with Gateway 400, then go to the line under it, and across to > MX6900.
Click on MX6900.
This is a PDF file.
After you click on the above file name it may take up to 30 seconds before you see the first page.
The file is downloading in the background.
It may also take additional time for the file to fully download, after the first page comes up.
Suggest you let the file fully download before looking through the file.
(Took 5 seconds for the first page to come up, 30 additional seconds for the file to fully download, just now.
I'm using a medium speed DSL connection)
I don't know if you are familiar with PDF files. If so, please disregard the following;
At the top of the PDF file is the Page Number Box. It's to the Right of the blue Down Arrow.
You can use the blue Down Arrow to get to a particular page, going page by page, or if you know the page number there is a faster method.
Put your mouse cursor in the page number box.
Type the page number
Press the Enter key.
The download you have just completed is just to let you peruse the PDF file. It isn't saved to your computer.
If you close the PDF file, you have to go back to the website, and download it again.
If you wish, you can save the file to your computer.
Using this method you won't have to download it again.
You can also burn a copy off to a CD disk, and have the file anytime you ant.
You can then delete the file from your computer, (After making sure the copy is good, and works), and save Harddrive space.
If you are not aware of how to perform this, please state in a Comment, and I will guide you.
You can easily increase, or decrease the view size of the PDF file. Use the Zoom In, or Zoom Out icon at the top of the PDF file.
The blue circle with the Minus sign in it ( - ) is the Zoom Out icon.
The blue circle with the Plus sign in it ( + ) is the Zoom In icon.
The Bookmarks menu to the left of the PDF file has two different options. I suggest using the option to go to specific points of interest using Bookmark links. This is the icon that resembles a page with a blue Bookmark on it.
Once clicked on, click on the + sign next to Replacing Notebook Components to expand the 'file tree'.
In the PDF file go to Page 38.
Replacing the LCD panel assembly.
In the steps are components listed that have to be removed, before you can remove the Hinges to replace them. These component step removals are listed in Blue.
Click on the blue component step to go directly to the page that outlines how to remove the component.
A) Remove ALL power to the laptop. Remove the AC adapter (Charger), and Battery.
B) Use a multi-compartment container for the various screws you will remove.
Mark each compartment for the area the screws come out of.
Some of the screws look very similar to other screws. They are Not.
Do Not mix them up.
C) You may wish to tape a piece of clear plastic to the LCD screen, to protect it while working with the LCD Display. All it takes is a wrong move with a tool, or fingernail, and damage to the LCD screen can result.
I use blue Painters tape so there is no glue residue left behind.
The LCD Display will have to be removed from the laptop in order to access the Hinges.
There is a Display Cable, (LCD Video Cable), and Antenna Cables going to the LCD Display.
(NOTE* If the laptop has a Wireless Module Card)
These tiny cables should be disconnected in order to prevent possible damage when removing the Hinges.
This is outlined in Replacing the LCD display panel as part of the procedure.
This is what the Hinges look like,http://www.mundocorp.com/shopexd.asp?id=6674
If you need guidance please post in a Comment.