Help please !!!

Hi All,
I'm trying to set up an extended monitor connected to my HDMI. I've followed all the instructions on line. I've adjusted all the settings on my nvdia graphics card etc etc. I'm using windows/P because my FN/F1 does not work. The 2nd screen just flashes, I then put my laptop screen down and back up to project back to my laptop !!!.
Any suggestions before I throw my Alienware against the wall !!!:mad: