What graphics card are you using? Onboard or dedicated?
Is this a laptop? Also, have you tried reverting the drivers to see if that was the problem?
No need to worry or uninstall / reinstall drivers. There is no problem. If the external display is disconnected, it is of course just normal that system only shows one display.
If you have updated the display driver when external display was not connected, it has restarted itself after update procedure, noticed that you are only using your laptop's display, thus showing accurate de facto status: only one display connected.
I repeat: no problem, no issue, no actions needed.
Kari
I did have two showing even though I am only using one at the moment but for some reason only one showing now....any ideas? Thanks
I read the first post where the OP clearly stated he's only using one display at the moment meaning the external is disconnected, thus this being a non-issue.
Kari