I burn the iso files with the disc Utility itself, and it works as expected. You find this tool in the Applications/Utilities Folder. Simply drag&drop the iso file in the left list box, select it, and say burn to CD.
This should do the trick (I am doing this all the time, and it works perfectly)
thanks for the tip. The cd works fine now. But the tech. support thinks now that my harddrive is broken. so tomorrow i will change my harddrive. The desk stays forever on the hog3 logo's.