A. You got iDVD ? - Not delivered on new Macs (at all)
B. When in trouble the first things to try are
• Start iDVD - but now keep alt-key down - and if it starts - Create a brand new iDVD Project - the old one is corrupted and as far as I know of beyond repair. Re-do and SAVE.
• If still problems - Run Repair Permissions - Disk Util tool
• Still not working - Trash iDVD pref and cache .files (or to test if this will help - Just start a new User-Account / Log into this and re-try if iDVD works)
Yours Bengt W