It seems that however I looked at a JPG it had the star-sky effect, some twinkling, some not. I figured it was the monitor, maybe the video card, both ideas were put forth in this thread.
My plan in troubleshooting/identifying the problem was to switch monitors. I bought a different 23" LED/LCD display shortly after I bought the Acer in question, a Samsung S23A350H, which I had connected to my downstairs laptop. This morning, I switched the monitor placements and the Samsung shows no such yellow glowing pixels at random locations, some twinkling. The amazing thing is that with the Acer connected to my Lenovo T60 laptop, the are no aberrant yellow pixels either! So, somehow it was that monitor connected to my desktop with it's nvidia BFG6600 2x DVI video card that does this, don't know why.
In truth, I think the Samsung on the desktop is a better idea anyway, because:
1. It's way way easier to adjust
2. From the time you turn it on until you get a picture is like a second, whereas the Acer takes 12+ seconds
3. I think the Acer looks better on VGA, which is what I get out of the laptop.
It was a hassle making the switch, partly because the Samsung only has VGA and HDMI inputs, whereas the Acer also has a DVI. I bought an HDMI splitter in order to support having the Samsung as my desktop's display. Besides my desktop I have the display set up to view output from my blu-ray players.
So, I have my workaround now, don't know what the problem was...
Last edited by Muse; 09-03-2012 at 02:40 PM.