Imovie crashes on startup

imovie crashes on startup, and the only way I can use idvd on my brand new imac is to open files using the version on my G5! If I copy iDVD from the G5 to the imac, it crashes on start up - I tried the same thing with iMovie, but it won't work that way - because it crashes on the G5 too! I can only use iMovie HD on the G5....thank goodness Apple let the previous version remain useable or I'd be screwed.

(I purchased ilife08 from Apple which I installed on the G5, and the imac came with it pre-installed).

How can I get imovie and Idvd working properly on my imac!??!? This is a brand new machine which makes this even more frustrating.

I've tried removing the preference files from the imac, but it makes no difference at all, and I have the latest versions of imovie and idvd.

I also have a potential new client coming over later this week to view an imovie project and I'll have to lean past the new imac to show him on the old G5 - not very impressive.

(I'll talk about my dislike for the new imovie later - I much much prefer ImovieHD anyway. I know Apple says the web's the way to go, but I need DVDs and good quality DVDs too - the web's not fast enough to play dvds here and won't be for a long time.)