Resolution problems when connecting an LCD to macbook

Hi all,
I've just bought a BenQ 20" wide screen LCD monitor (G2000WAD) to connect to my MacBook 13" (late 2008). I connected it with a VGA cable, converted to mini displayport.
I can't seem to set it to the optimal resolution, which for this screen is 1680x1050. The best resolution that works is 1440x900. If I try to set it to 1680x1050 the screen goes black, re-appears, goes black again, etc. The image in 1440x900 is not very sharp, that's why I'd prefer it to be on 1680x1050. I've also tried a couple of LG monitors, and they had the same problem.
Does anyone know how I can solve this? TIA!
Cheers,
Ronald

1680x1050 is sort of a strange resolution for VGA. Doesn't the display have a DVI or HDMI port? If it does have a digital input (DVI or HDMI) then it's possible that the VGA input for the BenQ just doesn't like the 1680x1050 setting (at least at the frequency and setup that is being output by the MacBook's VGA adapter). You need to check the following:
1.) Have you checked to see if Apple's mini DisplayPort to VGA adapter is running the latest firmware (Apple offered an update a few weeks ago)? Furthermore, unless you are actually connected to the VGA adapter when you run Apple's Software Update it won't notify you of the availability of the firmware update. However, note that this firmware update is only for Apple's adapter (I don't believe that it will work with any of the third-party adapters). Also, if you've purchased Apple's adapter fairly recently it may already have the latest firmware (but you'll have to check as I detailed above).
2.) Check the BenQ monitor's user manual to see what VGA resolutions and frequencies it supports.
3.) If none of the above solves your problems then you _may_ want to consider getting a mini DisplayPort to DVI adapter (if your BenQ display accepts DVI or HDMI). If you only have the option of HDMI then you can either purchase a DVI to HDMI adapter to connect to Apple's mini DisplayPort to DVI adapter or you can purchase one of the recently available mini DisplayPort to HDMI adapters from a place like monoprice.com (link follows):
http://www.monoprice.com/products/product.asp?cid=104&cp_id=10428&cs_id=1042802&pid=5311&seq=1&format=2

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