Older Macbook Pro Resolution stuck at 1440 x 900

I have mid 2011 Macbook Pro 13" 2.53 GHz Intel Core i5 running 10.6.6. Recently it has developed a problem with the resolution settings. The highest resolution I can achieve is 1440 x 900 in Syetem prefs. It also means that i cannot see all the screen at one time. I have tried to delete any prefs I can see with Displays in them and it has made no difference.
Has anybody seen this problem before I have never come across anything like this before. I am currently downloading the 10.6.8 combo update and may try an update to Mountain Lion if this doesn't work.
Thank you in advance

You know what I can't remember, pehaps its not the resolution that's the problem, it's just that I cannot see the whole screen at once as if it has been zoomed, but as far as I can tell it hasn't. Made me think a bit differently about it. Thanks

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