The solution to this problem: I used the HDMI port on my laptop and connected it to the DVI-D port on the Dell monitor, which works now.
I am unable to connect the DELL LCD monitor from the DP port to my HP Laptop with HDMI port. The Dell monitor has DP, VGA, DVI-I. The laptop has only an HDMI out port and USB port. I have used a DP to HDMI adapter and get the message: There is no signal from your computer. Press any key on the key board (which I have done) or move the mouse to wake it up (done). If there is no display, press the monitor button now to select the correct input source on the On screen display menu (done). No success. [IMAGE][IMAGE][IMAGE][IMAGE][IMAGE][IMAGE]
HP HDMI out not working on monitor DP in?