I have a Toshiba Satellite L645D with ATI Mobility Radeon HD 4200. I use the laptop display and an AOC monitor as dual monitor. However, I usually switch to only the AOC monitor when playing games beacuse playing games with dual monitor is too much for my mid-low end laptop. Everything works just fine up until today, when I was done playing a game and wanted to switch back to dual monitor, nothing happens! I tried switching to Extend, Duplicate, and Diasble External Display, and nothing happens. Then I tried checking Display Properties and I found out that my laptop monitor isn't detected, only the AOC monitor. If I try to disconnect the monitor, my laptop display doesn't turn on.
Please help! My laptop's OS is Windows 7 by the way.