Pixel-wide distorted lines jumping around

I admit that topic sounds confusing - but then, so is my problem:
A few weeks ago I noticed some distorted lines on my MBP screen (first generation 15"). The appearance is as if two adjacent rows of pixels "bleed", they seem to be identical, smearing whatever is on the screen in that position out across this pixel-wide band (there are several such bands or lines, both vertical and horisontal).
The really weird thing is, they come and go - they're mostly there and mostly in the same places (two vertical ones and three horizontal) but occasionally they disappear, then reappear, and, stranger yet, they shift about when I move the cursor to the lower right corner of the screen (at which point the entire screen seems to shift or jump slightly - one pixel? - up and to the left).
The lower right corner is inactive, the only thing that happens when the cursor is there is that the dock pops up - but the lines don't react to the dock appearing when I put the cursor anywhere else along the bottom of the screen, only the right lower corner.
I didn't do anything (that I'm aware of) when it first occured - no installs or re-installs, no updates, nothing like that. I haven't dropped it, stepped on it or had it run any hotter than usual, in short, no particular event or behavior caused this problem to start...
Anyone?
Jj
MacBook Pro 2.0Ghz/2.0 Gb RAM   Mac OS X (10.4.9)  

I'm having the same issue. It just started this afternoon. Do you have Parallels? I was using Parallels with Windows Vista Business when it first started. I don't know if that has anything to do with it or not, but Windows was doing some weird things with screen resolution, jumping between a couple different settings by itself, just before this weirdness started. At first I thought it was Windows but then when I switched back to the Mac I noticed it was doing it there too.
I've rebooted, and changed the screen resolution, but nothing has helped. The text looks kind of blurry unless I mouse over it and then it either gets sharper or way too sharp as if it's been through a heavy sharpening filter. Anywhere I move the mouse there's sort of a pixel-shift where the pixels look as though they're being smeared around by one pixel. Also, If I move the mouse quickly left and right the whole screen goes back and forth about a pixel.
There are two other interesting things about this situation:
1. I'm using a dual screen setup with my 15" MacBook Pro and a 23" Cinema Screen. It does it on both of them, and continues if I unplug the CS and only use the MBP screen.
2. If I log in as another user, *it doesn't do it anymore* - only under my main user account does it happen, which also leads me to believe that it might have to do with Parallels. At least it would appear to be software related instead of hardware related.
Was there anything you can think of that you did to make it stop? This is really annoying!

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