Macbookpro doesn't recognize max resolution of an external display

hi
i have a macbook pro 7.1
i just bought an external display, LG IPS237L-BN 23 inch Full HD IPS LED Widescreen Monitor (250 cd/m2, 1920 x 1080, 5000000:1, D-sub, HDMI)
my mac doesn't seem to recognize the resolution. after some internet research, it seems to be a common problem, except that all i've seen are some solutions via dvi port. My monitor has only 2 hdmi (from what i can tell, i'm no expert), and some "d-sub", whatever that is.
I've had a small mdp adapter, connecting via hdmi-to-hdmi cable to the monitor, but to no success. I thought it may be the prob with the adapter as i've bought it a while back, so i went and got a mdp-to-hdmi cable (this one: http://www.amazon.co.uk/gp/product/B00675Q2UY/ref=oh_details_o01_s00_i00?ie=UTF8 &psc=1), but again, the max resolution in display preferences is 1600x900, and all is blurred, while my main purpose is photo and video work.
Any advice?

Hi
did you found the solution?
I have MBP 7.1 too, and just bought an LG 22" FullHD monitor, but i got the same problem.
I can set the resolution to 1920x1080 but the screnn on external display is not like fullHD, and its not as colorful as it can be(I tried the monitor with my windows laptop, and the colors and resolution was ok).
I'm using Mini DisplayPort to VGA adapter to connect them.
Help me if you can!
Many thanks,
nelsonhun

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Macbookpro doesn't recognize max resolution of an external display

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