How do I darken the colors coputer screen - Aspire Acer Computers & Internet

You can usually can only alter or darken a print colour from the software program (i.e. Word), then send your document to the printer.

Replace the lcd panel. Likely it will be cheaper to replace the set.

your screen is damaged, probably water damage.

Each filter intensifies its color and darkens others, especially the color opposite on the color wheel. They're not of much use in color photography, unless you want weird color casts, but they come into their own in black&white photography.
For example, a red filter intensifies red and darkens blue. It can make a sky look almost black, making clouds pop out. Similarly it can darken foliage. A green filter on the other hand will brighten foliage.
If your camera can take black&white photos, try taking pictures of a red rose with green leaves with and without the filters. With one combination the rose and the leaves will be the same shade. With a red filter the rose will be bright against the dark leaves. With a green filter you'll get a dark rose with bright leaves.
With digital photography you can achieve the same effect in postprocessing, but some times its easier to get the result in camera.

It is very common for the color of the lamp to change as it nears the end of it's life. Depending on the bulb itself you may see yellow, green, or blue shifts (I have even seen red/orange). This is due to the diminishing output of the bulb and while you can make some adjustment you will eventually hit the point of failure. The bulb could in fact last several more weeks or even months depending on your use and environment. It is probably a good time to start searching for a replacement now so you can replace it as soon as it dies or just replace it now if the color is too bad to be worthwhile.

if it is darkening then yes. if it is giving you colors on the screen like a blob or star pattern it is the optical block.

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the screen bias needs to be turned down-ehind the front cover which is behind the grille there is a small black square about 3 inch square 6 little knobs sticking out 3 say in small letters screen and 3 say focus, don't adjust the focus just the screen for the coresponding color that shows up when picture is dark.best way to do this is darken the room and put it on video input with no signal if lines are white slowly
adjust 1 color after the other counterclockwise untill
lines disappear if only 1 color shows then only adjust the knob with the matching color. this is a very fine adjustment, to much will make your auto focus stop working. check it after you are done

my apple  ibook screen will power on but I can barely see it's on, I changed the mother board and every thing else seems to be ok

not sure but you could have a bad color wheel i would suggest a service call from your local shop