some selfboot games work but, some go to the cdplayer

[Megalexxx]

Might be a problem of low qualiy CD (your DC can't read data properly) or a sort file problem. Your DC might take some time to read data that isn't properly sorted. You won't do anything unless you know which files are accessed many times and put these files on the extern border of your CD. In one word, you'll have to remake the release...
But first, try with other CDs...