That's one problem with analog LCDs -- sometimes the adjustment doesn't always work, or it gets out of sync. One trick that I've used is this: create a 2 x 1 horizontal bitmap of two pixels, one white, one black. Set that as your desktop background and tile it. You'll see a bunch of very fine white and black lines. If you see fuzzy gray, then adjust the horizontal synch until they become distinct black and white lines. I use that to manually sync my LCDs sometimes. For some reason, my Dell LCD has a problem synching with my old GeForce, so I have to employ this trick.
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