Hi, your i5-750 (Lynnfield) don't have integrateted video. You need one of the newer Clarkdale i3 or i5, they have integrated graphics, not the board.
You should also use only memories with max. 1,65v. Higher could damage the cpu. For maximal compatibility look at the intel compatibility list of your mainboard. My DH55HC runns only stable with one of these memories (micron). I use a i3-530 with int. video and running dual monitors. Primary on HDMI and 2nd on DVI. You will not see your desktop if you use the DVI as primary.