On Tue, 13 Apr 2010 02:01:11 -0700 (PDT), thomas albrecht
wrote:

Dear all,

My Samsung 204B has a *very* long response time, black-white several
secs.. white-black ~0.5 sec. This happened instantly while in
operation, and persists ever since. Happens both on DVI and VGA, with
different graphic cards (NVIDIA GF 7600GS and ATI 7500) as well as
without any signal input at all, then showing the wandering "Check
signal cable" window. I opened the case, the caps look OK to me, no
bulging or leaking.

Here's a video showing the slow response. The graphics should be
updated instantly. Instead, it appears more like a fade-in
http://www.youtube.com/watch?v=8tcwLBV3jxs

Any hints are greatly appreciated.
Thomas

Did you try a different monitor to eliminate any possibility it is GUI
effects from Winders?