I have Dell Inspiron laptop and a Dell U2312HM monitor. When I try to use the DisplayPort input to the monitor by connecting a Dell HDMI-DisplayPort adapter to it, it immediately goes into power save mode, even if the laptop is not connected. The only way I can get the monitor to come out of power save mode is to disconnect the HDMI-DisplayPort adapter. When I do that, the pop-up appears on the monitor saying it will shut down in 5 minutes unless I hook up a video source to it. But of course when I try to do that, it immediately goes into power save mode anyway. Connecting the laptop and enabling the external monitor has no effect on the monitor - it stays in power save mode. The laptop does not detect the external monitor. I have not found any way to get the monitor to exit power save mode. This looks like it is entirely a monitor problem since it goes into power save mode immediately from just plugging in the adapter. Please tell me what to do.