i have a file my friend gave me that has tiger in 4 diffrent disc files. when i open each file they are in .dmg files when i burned the first .dmg file to a cd and tried booting my ibook g4 off of it by holding c at the start up but it wont work. so i tried buring all 4 .dmg files to the same disc and tryed booting off of that and that didnt work either. all that comes up is: 
radeonfb 0000:00:10.0: Invalid ROM contents
HELP!
radeonfb 0000:00:10.0: Invalid ROM contents
HELP!