Very unusual problem with extended desktop

I'm trying to connect to my 24" 1920x1200 LG monitor through mdp>hdmi. The extended desktop is working and displaying an image on my external monitor.

However, the big issue is that the image is way off center and has empty black space on the bottom and right side of the external monitor... What could be causing this? I'm using a third party mdp>hdmi adapter but it works fine when connected to my 40" sony tv... just off center with this monitor


by the way, it's a 2010 MBA with nvidia gpu.

 

the air is running at 1440x900 (I'll try changing it to see what happens). and the external setting is 1920x1200. I just reset the PRAM and that didn't fix it.

You are probably right. I think it's an issue related to the LG display b/c I plugged in a family members 15" MBP (mdp>hdmi) and it's doing the exact same thing.

I've used this monitor for just about everything in the past and it always worked fine (including a Macbook w/9400m).. weird.

Thanks for trying to help

 

well, this is the monitor I've had for a few years http://www.lg.com/uk/it-products/monitors/LG-lcd-monitor-L246WH.jsp

the only inputs it has are hdmi, vga or component. It's the main monitor for my win 7 desktop through hdmi (which works very well).. so this is puzzling me

I don't feel like buying another adapter.. but I bet a mdp>vga adapter would work w/out a problem

 

a little update. this is beyond frustrating..

I just bought a Mini DP > VGA adapter which is working. But it's only showing a max resolution of 1920x1080 !! It's all nice and blurry.... why is it doing that when the native res of my monitor is 1920x1200? I"m so annoyed right now b/c I was sure this would solve the problem..

One of the main reason I bought this MBA was the ability to use it with this monitor... Now I'm pissed..

Maybe I should call Apple and tell them to update the drivers for my monitor or something.. I feel like it's their problem & not the displays