Can't get external monitor working!

I have a Acer laptop with a nVidia Go 7300, and an external Acer monitor (AL2051W). The other monitor is recognized (the model number and everything) by the graphics card, and I can set the right resolution (it's 1680 by 1050 or something odd like that), but no matter what I do (clone/dualview etc.) it won't work. I just get a "No Signal" error then the screen goes blank, at any resolution I try. I've used the monitor before (on a 6800), but it won't work with the 7300 Go for some reason. The drivers are updated, but I had to download them from Acer's website. I'm not sure if that would make any difference, but it seems that it's working fine, since it's recognized and I can set the right resolution, just nothing will actually show up on the monitor. Any ideas? Thanks a ton.