Burning problem

Hi,

I'm facing somewhat of a mysterious problem when trying to burn a handful of DVD's that I need to burn from ISO-files.

The films work as they should on my macbook, however when I try burning them the problems arise. When burned they often stall with something like 12-14 minutes left of playing time, some already before I reach the menu and still others in the beginning of the film

I've tried using both disk tool, SimplyBurns and Toast for burning. I've used both DVD- and DVD+ disks. I've burned in both the slowest and fastest burn speed. I tried turning of the verification process. I tried watching my DVD's on 3 different DVD players and finally I've even tried borrowing an external burner.

I end up with the same problem: most of my DVD's don't work, even if I don't get any error messages along the way.

So, can a genious tell me what might be wrong?

Where did the ISO files come from and which program was used to create them? It sounds like the files may be corrupt.

Im not quite sure how they were created as I'm not that technical

But the files are not corrupt, since friends have been able to burn without problems.

Can it be a hardware malfunction in the macbook related to the burning process, but not in the burning hardware itself?