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If it is not working sufficiently, I would say try opening it and see what you can do. There are lots of places that describe the operation of opening and working inside PPCs. Look on Google, maybe find something on replacing the screen, since that is the area you are working on.
If you can clean it then you are good to go, and don't need to spend more money. If not, well, you haven't lost more than you already knew you lost.
Let us know if you go under the knife, and how things work out. Some pics would be great to see too.
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