iDVD stops at Stage 4

Don't know if you've had a problem with this, but iDVD (this is version
4.0.1) stops on Stage 4 and will not burn the DVD. I left it alone all
night and it still won't burn, you can actually hear where the disk
stops turning and the computer just kind of remains in stasis. What's
strange is that I usually don't have problems and my last project
(which was only about a minute long) will burn just fine, but this one
(at a little over four minutes) just won't burn. What can I do to fix
this?

Thanks in advance!