Imac 400mhz dv - display -ghosting /3d images

or display has gone somewhere - with ghosting / or 3d like with out the glasses

Could the display have accidentally been set to run in black background
mode where it looks like a chalkboard? There are a few settings in OSX
and in OS9 that can be set via keyboard commands without going into
the control panels. In OSX, one of the system preference control settings
which may be toggled incorrectly for daily use and that could affect the
display somewhat as described may be found in "Univeral Access>See"
and the setting starts out normal, saying "Switch Black on White."
In the keyboard system preferences control panel, there is a shortcut
for engaging the above universal access panel's Switch Black on White;
so that may have been accidentally pressed; it would require pressing
3 or 4 keys, if the shortcut was activated from from keyboard.
So, maybe that's what is going on. If so, that's a sigh of relief!

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