Audio problems after transferring from external hard drive.

I've transferred an unfinished movie from an external hard drive back onto my mac but now when I play it the audio jolts and is crackly for lack of a better word. How can I fix this?
It's a birthday present for someone that I need to give today so help would be much appreciated!

Is your external drive formatted for Mac? Should be Mac OS extended or Mac OS extended (journaled). If it's not, you will need to reformat using the Utilities/Disk Utility app on your Mac -- but reformatting will erase all data on the drive.
The bad playback may just be an iMovie playback display problem that might not appear on your final project. Quickly share your project to iDVD and play it there to see if the sound acts up. If it doesn't, then it's just a playback display issue in iMovie. That can be caused by overlapping sound tracks or too many audio clips or effects, although you didn't mention whether you were talking about audio embedded in your video clips or separate audio clips in your audio track.
The most favored audio format is .aiff, so if you have separate audio clips check your format to see what you have got, and if not .aiff try converting it to .aiff. You can do that in iTunes or by exporting it under Expert Settings as an aiff file to your desktop and then dragging it back in to your movie.
You could try the old standby of closing iMovie and trashing the file com.apple.iMovie.plist found in User (your name)/Library/Preferences. Then do a permissions repair using the Utilities/Disk Utility app on your Mac. Make sure you have at least 15GB of free space for iMovie to work efficiently.
If you are using iTunes music, you might try first burning the music to a music CD, and then importing it from there into your iMovie project.
Hope this helps. Perhaps others will have more suggestions.

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