Hi Maverick69 and welcome,
The “blue dot” simply means the file (movie in this case) has not been played yet.
So are the files actually in iTunes or are you simply playing the files with Quicktime?
Are you certain after loading the files into iTunes, the files are still on the hdd in the original location, ie., the same file path as when originally loaded into iTunes?
You shouldn’t receive the error message…“file not found” on the Ipod, but rather in iTunes. The Ipod will sync automatically or manually depending on how you configured iTunes, but afaik, you can’t prompt the Ipod to look for a file.
The Ipod will only sync with what iTunes tells it.
What I’m trying to say here is that it is iTunes that determines the proper file location and what is actually sync’d, not your Ipod.
Please delete a file (movie) from your iTunes and then load it into iTunes again. Then plug your Ipod into your pc, sync it with iTunes and attempt to play it on your Ipod.
Let us know what happens.