The X11R6.1 server distributed with MkLinux DR2 can't deal with displays
deeper than 8 bits. You can get MkLinux to boot in 8 bpp (switch to 256
colors in MacOS -- you may have to toss your Display Prefs to get the
change to stick), and then X should work.
 
With X11R6.3 you can use any color depth.  See the where can I get X11 FAQ entry.
 
penney@cps.msu.edu