External monitor stopped working on Macbook Pro

I have a Macbook pro 15 with the vga adapter. I have been using it sucessfully for a month. Today it stopped working. I followed all of the suggestions online but have had no luck resolving this issue. The monitor works fine on my sony laptop but the Mac cannot see it. I have unplugged the adapter, shut down, turned on and plugged it back in as recommended. I tried a different monitor and i have simply restarted the machine with the adapter plugged in. I would greatly appreciate any suggestions.

Try doing a Parameter RAM reset - hold down command/option/p/r keys at start up and wait for three chimes before releasing the keys.

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    No doubt, the Apple displays are gorgeous. The first time I saw the 30" display wow, I wanted one BAD and it's actually what prompted me to buy a "big" monitor. The colors are great with a rich wonderful saturation level and as usual for Apple the form factor design is stunning. You know for that picture quality I could even get over the sticker shock and save up for one.
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