I have had a continual problem with Windows 7 (currently running) updates and my second monitor. Previously, after an update, the second monitor wouldn't work and I would roll back the update and then it worked fine. However, after this last update (end of December) I cannot get the 2nd monitor to be detected.
Information on my system:
Win 7 (updated to Win 10 but 2nd monitor didn't work so reverted to 7)
Display Adapter: ATI Radeon HD 4200 Driver version: 8.850.0.0
Second monitor connected by HDMI
Things I have tried:
Updating display driver
Deleting and reinstalling display driver
Unplugging/plugging back in
Random information that may help: Monitor is on, when I turn on the computer the light turns from red to blue, then goes back to red. My mouse will go over to the second monitor as if it is there (when extending option is chosen), however, screen is black and you can't see anything on that screen at all. The second monitor works, as I tried swapping the monitors but same thing..whichever one is set as second is black. One time, after an update, the monitor wasn't working but I left it plugged in as normal and the screen came on and worked fine. After the next update, it went back to black.
I tried to figure out, on my own, which particular update was causing it to not show and I wasn't able to figure it out. I also disabled the automatic updates....so I thought...but it updated anyway.
At a loss and am dependent on the second monitor for work.