Yes, the LCD screen "face panel" can be replaced. However, note that this part is the most expensive part of the monitor. If your monitor is more than a year or two old, it may be difficult to find a replacement and it may be more cost effective to simply replace the whole monitor.
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The glass of the panel is glued or welded to the LCD wafer below, it cannot be replaced separately. Since the panel is the most expensive part of an LCD monitor, its probably the cheapest option to just get a new monitor - spare part ordering and extensive manual work required for the change simply outweighs the remaining value of the monitor.
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.
OK, thanks to hihai in another posting, I was able (finally) to get into my monitor. Use a wide, thin knife and insert it between the grey plastic and the black plastic at the top or bottom of the monitor. (its easier at the top or bottom as you can distinctly see the deliniation between the grey and black - on the sides it's all black and the fit of this bezel around the monitor is so tight it's really hard to get in to the crack to pry the thing off). At any rate, once you get your thin knife (I too used a butter knife) into that crack, gently slide it to one end or the other. There are tabs near each end and a couple in the middle - you'll feel a bit of resistance near each tab as you slide the knife. Position the knife close to one of the end tabs. Rotate the knife handle outwards away from the monitor effectively prying the bezel upwards away from the face of the monitor. As you pop each tab, work towards the opposite end of the same side of the monitor. Once you have both ends dislodged, inserting the knife to pry up the all black sides will be easier. Unfortunately once you have the top (or bottom) and both sides loose the remaining top (or bottom depending on which one you started with) becomes a bit tighter to get the knife into.
Here's my word of caution. Be very gentle. While I was trying to find the way to get the bezel to come off I attempted to slide it in between the monitor face and the bezel itself and unfortunately cracked the glass face inside the monitor rendering it useless.
As for the power button, the button had worn down so much from use there simply was no travel left to push the contact on the switch board in the bezel. I tried a dab of hot glue on the inside of the power button to give it some more contact to the switch on the circuit board but didn't have enough. I was able to push the switch on the board with the circuit board removed from the bezel (with a tiny screwdriver not my fingers) and the monitor powered up fine. It was then I discovered the broken screen. Damn.
Sharp televisions have a few layers of plastic before getting to the actual screen, these are very cheap to replace, and they just require you to take the cracked one out and replace it.
However, if the picture is affected, then it will cost alot to replace the screen, hopefully you have warrenty, you may want to replace the tv itself
For the brave of heart, You can disassemble the monitor. After you get in to the inside of it, you'll see a circuit panel with 6 ballast coils on it. On my Cinema display, what happened was that the solder joints on some of those coils had cracked, causing intermittent connection. After hitting all the connections with a soldering iron to heal the cold solder joints and re-assembling it, it is working perfectly fine now.
I had the same problem with my monitor, saw only coloured vertical lines. I opened it, opened the back of the metal casing to get access to the circuits. There I found a loose connector. I reset it and it worked again!