Problems with M2459D HD LG monitor

I have connected an LG high definifition monitor (model M2450D) to my Mac Book Pro (Intel Core 2 Duo, late 2008, Snow Leopard) via HDMI. Letters and borders seem to be out of focus. LG doesn't have specific drivers for MAC.

Thanks for the answer. Yes I already tried what you suggest with no result. My Mac seems to read my monitor correctly. I cannot chose the refresh rate (it is fixed at 60 Hz), but I noticed that the maximum resolution I can set is 1680 x 1050, which is not the one of my monitor (1920 x 1080). I noticed the same when I connected my Mac to a Sony HD tv.

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