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Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/ In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.
Make sure you are online and the internet icon confirms the status.
Go to the Control Panel/Device Manager/Dispaly Adapter and right click the Mouse and click on Update Driver if that does not work uninstall the driver and power-off your Mac and switch back on. The OS should then reinstall the driver.
Ok I guess you have an optical mirror chamber error sounds good doesnt it but can happen if projector has been knocked or dropped in the optical engine there is a chamber connected in between the main lamp and internal glass lens you may see it if you look inside the lamp assembly this very small chamber has four very small mirrors in it and is held in place usually by a metal plate bracket you may find one of the mirrors has moved or dropped this makes the refraction of light incorrect which will cause your dark shadow on your image screen
Try to lighten the screen reolution. Turn the calculator on, press the 2nd key. Then hold the down arrow key. This should lighten the screen. You can darken the screen also. The only difference is hold the up arrow key down until it's dark enough.
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
After a battery replacement the screen contrast may become too dark or too light. I suspect that in your case the screen is too light. To darken it Press [2nd] key and release it. Press and HOLD [UpArrow] until screen darkens enough.
Hi, Check that the terminals in the battery compartment are clean
and shiny. Remove any powder left after battery leakage. Insert fresh
batteries in calculator. Make sure you respect the polarity diagram.
+-+- (Many malfunctions come from incorrectly placed batteries).
After replacing batteries, calculator is restored to defaults and screen display may be too loght or too dark
To adjust the screen: Darken or lighten display
To darken screen
Press [2nd] key and release it.
Press and hold [UpArrow] until screen is dark enough.
To lighten screen
Press [2nd] key and release it.
Press and hold [DownArrow] until screen is light enough.
In your monitor panel you'll find 4 buttons. Press the menu button and get into Magic Bright. There you can choose the one that best suits you. You can even set to Dynamic contract where the monitor adjusts the brightness according to the elements on the screen