Mac Mini display on boot up

Whenever I reboot my Mac Mini I have to reset the display settings.
I am using a Pioneer Plasma display 506FDE conected by HDMI cable.
When it boots up the display is a very limited number of colors (maybe 10 or so).
I go System preferences - Displays - Options - check Overscan (which reduces the size of my display). This resets the display to a decent level and I then uncheck Overscan to get the display size set correctly
I have tried resetting the pram and trashed ~/library/preferences/com.apple.systempreferences but to no avail

Problem solved by resetting the pram holding apple-option-p-r during startup until you get an extra set of the startup chimes. also, trash ~/library/preferences/com.apple.universalaccess.plist.

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