HI Jason,
Thank you for the reply, so let me give some feedback on what we did to resolve:
We took 3 makes of LCD/LED screens, LG smart tv, Samsung smart tv and NEC. All screens did the same thing on scaling, NEC was better but we did still have issues. We then took the Core i3 NUC and re did the same test on the three screens. Without adjusting the screens settings, the NUC was able to resize to the correct scaling we needed on the screens.
Thus, With the Celeron, we adjusted on the LED screens settings, 16 x9, 4 x3 Just scan, custom resolution and no luck at all. In fact we have a good relationship with one of the manufactures and we were able to go into backend scaling options with their consent and adjust, although it was close, it just would not scale to what we needed and this is not an option as we may not always use the same manufacture on the project we are running.
The drivers in my opinion are the issues and not the actual hardware. When we loaded window 7 pro, without the HD graphics drivers, we were able to scale to full image of the screen but my software requires 1280 x 768 and not 1280 x 1000. The graphics driver were the standard VGA drivers for Windows 7.
Also something to note, if the screens native resolution is 1368 x 768 for instance, then the NUC celeron would scale to full screen giving you the maintain aspect ratio option, however as soon as you take it down to say 1280 x 768, the only option it gives you is centre image, nothing else and this is where the issue lies. It should offer maintain aspect ratio or custom ratio as with the core i3 version.