Okay, I used my second screen on my computer to display WMP so I could see it in bed. And this happened The first screen was off, and the second switched to primary. The 17" is connected through the D-Sub primary port, the 20" is connected throught the DVI second port with an adaptor. I'm not 2 worried about it as i'm fairly sure why it did this (didn't completely disable, just turned off) Just thought it was interesting.