(Answer) (Category) Linux on PowerPC FAQ-O-Matic : (Category) X Windows :
My grayscale monitor has a screwed up cmap; i.e., "blue" looks just like "white".
There's an argument that needs to be provided to the X server which will 
clear this problem.  The argument is "-cc 0".
 
If you start X from the command line, in /usr/X11/bin/X11, change the 
call to xinit like this:
 
xinit -geometry 60x8+0+0 -sb -fn 6x10 -C -T "console" -e $X11START \
       -- ${X11BINDIR}/X -cc 0 nologo v $* >> $DEBUGLOG 2>&1
 
If you use xdm, change the line describing your screen like this:

:0 local /usr/X11R6.3/bin/X -cc 0

                                        cwg@DeepEddy.Com
cwg@DeepEddy.Com
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