Macbook mini-dvi to vga display resolution issue

Hi,
I'm connecting my 13in first generation macbook to an external LCD display.  It's an ACER AL2216W.  I'm running latest Snow Leopard.  
I could always just click 'detect displays' and it would figure out what kind of monitor I had and I would be off and running at the native 1600x1050.  
Now for some reason when I click detect displays, it only shows the laptop native resolutions.  There is no 1600x1050 in the resolution list and instead of saying "ACER AL2216W" at the top of the display preferences, it just says "Display"
I've tried rebooting, plugging in and and out my monitor cable to the macbook and a variety of other things but to no avail.  I'm forced to use 1024x768 right as it is the only resolution that displays correctly on my monitor.   Any ideas on how to get back the detect display working and have 1600x1050 resolution again?

I have a 40 lcd tv and have my macbook hookuped to it using the mini display port to vga and it looks really good, but i only use it for watching movies. Dedicated monitors are still better for reading text or playing games

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