External monitor not going full resolution on extended desktop

Hello,
I have a Gateway widescreen 1680x1050 resolution monitor plugged into my 13" Macbook Aluminum computer. When I have both my external and built in display turned on extended mode, my external monitor only goes up to 1600x1000 resolution, which is obviously lower than full-res. When I close the lid of my Macbook (and run the external display only), the external display goes up to full 1680x1050 resolution. Could someone please help me solve the problem of my Gateway external display going to less than full res on extended display mode.
Thanks a lot!
Adrian

There is a clue here in what might be going on. Note that the MacBook's 1280x800 display is a 16:10 aspect ratio (exactly). Now, the external resolution that is reported by shmootz is 1600x1000 which is also a 16:10 ratio. It looks to me that the system is running as if it is in the mirrored mode. The video driver will force the displays to the same aspect ratio when running as mirrored displays.
I'd try a few things to see if you can reset the display options. First, try toggling the "Mirror Displays" option in System Preferences -> Displays -> Arrangement. Second, you may want to try a reset of your PRAM and the SMC.
Here is a link to Apple's support article on resetting the PRAM:
http://support.apple.com/kb/HT1379
Here is a link to Apple's support article on resetting the SMC:
http://support.apple.com/kb/HT1411

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    Mirror: Off
    Online: Yes
    Rotatino: Supported
    Mac#2:
    MacBookAir6,2
    Intel Core i5
    1.3ghz
    Intel HD Graphics 5000
    External Monitor: No information as it's not connected at this time.

    Well low and behold I tried clearing PRAM again and I reset my monitor to factory defaults. Reconnected my monitor and the thing works now. Very strange but I'm Happy that it's working again. *WHEW*

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