This morning I had two monitors, now I have one ... I have absolutely no idea what was installed or what changed but one of my monitors just stays dark. Windows cannot see the second monitor even in the display applet.
I have confirmed it is working by removing the driver and updating to the latest version ... when the driver was removed, both monitors were working (duplicated and incorrect resolution) but once the latest driver was installed the system went back to one working monitor (at the correct resolution).
EDIT: I have updated the system BIOS (Asus P8Z77-V LE) with no difference.
Any idea why my monitor won't work?
No worries ... solved it.