Ultrastudio Mini Monitor stretched image!!

Hi, I have a Ultrastudio Mini monitor (original not 3G) connected to HP Dreamcolor 24x Monitor that has resolution of 1920/1200.

The image seems to be stretched vertically. I am testing it with QuickTime clips that are 1920 by 816 I have tried image scaling of changing clip attributes and got close but still can see a slight stretch.

Any ideas?

I have fixed this. Aspect ratio had to be amended on the monitor it self.