I have a HP ProBook 4320s Notebook PC running Windows 7 Professional. I have always connected this to an external monitor but since trying to connect to a projector recently (which didn't work) the screen no longer displays on my monitor.
The display settings show the Philips monitor I'm trying to connect to, even featuring it as the current chosen option in the display profile. However, the screen continues to be displayed on the laptop monitor whilst the external monitor remains blank. Any help would be greatly appreciated.