Hi everyone, if you burn an OS CD you must make sure the finished CD is burnt as a MODE2/FORM1 CD.

Most CD burners will burn as Mode1, and the Mk3 cannot boot from a Mode1 CD.

All your problems are caused by Mode1 CDs.

Make the CD a mode2 and it will burn OK.

Mode2 works on Mk3, Mk4
Mode1 only works on Mk4

You should verify that you have a Mode2 CD before inserting into the nav system

I use ImgBurn to verify my CDs.

Note that 3/1-63 was the last official version for the Mk3.
I have 3/1-64, but that's with custom splash screen and custom menu text :-)

Jochen