I'm having a similar issue with this.
My system will boot a CD but will not boot a DVD. I'm using Ghost Corporate 2003. Steps I took....
1) made the two Ghost floppies (CD/DVD).
2) copied these to my HD
3) Used Nero to burn the DVD which contains the image, the contents of the two floppies (Win98 DOS mode + Ghost.exe), and the boot sector. On the "boot" tab, I changed it to first 4 sectors/no emulation in Advanced settings.
If I do this with a CD and leave out the image, it boots fine. Could it be my drive? It's really old.
It never even goes past the "Boot ATAPI CD-ROM: " prompt. If I wait long enough it says Non system disk or disk error, which leads me to believe it didn't write the boot sector right... but the same procedure yields a working booting CD. I am stumped... Please someone help!