Won't Detect LCD

Hi, I recently purchased a 19'' Norcent LCD monitor and plugged it into my mac mini through the DVI adapter. Since then it has been working perfectly and it detected the exact monitor it was in the display menu. I had it running through a 1440 x 900 resolution.
Today, I turned on my mac and it started up in a low resolution, (also, for some reason an old picture that used to be my background that wasn't even on my computer anymore was the desktop). I tried to detect displays but its only coming up as the "VGA Display". Also, it will not let me get a 1440 x 900 resolution anymore. Any help would be great. Thanks.

Hi-
Might want to reset the PMU:
http://docs.info.apple.com/article.html?artnum=300574
or, SMC (Intel Mini):
http://docs.info.apple.com/article.html?artnum=303446

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Won't Detect LCD

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