Mine were new, and it took about 1-2 weeks of heavy use for the borders to fade.
One of the monitors was the Westinghouse L2410NM. Others have noticed the same problem:
In particular, look at rdewey's post. Is it possible your monitor...
The screendooring I've noticed has been ridiculously noticeable, so I am just unlucky. :( And perhaps I'm using the term incorrectly - I meant rows of pixels that are spaced slightly more than the rest of the rows, inconsistently.
The buzzing on the second Westinghouse gave me a headache...
Everyone post your bad LCD experiences here! I'll start.
I've gone through five (5) LCDs total and have had to return them all.
Westinghouse L2410NM (Newegg) - Very noticeable screendoor effect in upper right corner.
Westinghouse L2410NM (Sam's club) - Not as noticeable screendoor, but...
This is what I mean by screen door effect: http://xtknight.50webs.com/lcd26/page3.htm
It's barely noticeable and only shows on certain light colors, but it's definitely only happening on one part of the screen. Gotta love LCDs!
The one I ended up sticking with is the Soyo DYLM24D6. I got it for $275 at a local OfficeMax and it has an MVA panel (which are getting hard to find). :) Just watch out for the TN versions of this monitor (if you don't want TN, anyway) - basically, if the box says 6ms response time, it's MVA...
I hate to say it, but there is no quality LCD. I've gone through about 4 (non-TNs) already and they all sucked (uneven backlight, discoloration in a corner, image retention, bad screen door effect), but my current one is least-suck and it was cheap. :)
Does anyone else notice a slight screen door effect in the lower left corner of the (MVA) panel? It seems to show up only on some colors (such as light gray/white). I remember seeing something similar on my LG L246WP (it uses the same panel) now that I think about it.