Ahun that doesn't work you need to do this:
(I also use the same method below)
First thing first as i checked your monitor on Samsung website it has DVI Input which you should be using for console/hdmi input.
Now as you have dvi on your monitotor and hdmi on the ps3 u need this cable
http://www.amazon.com/AmazonBasics-HDMI-DVI-Adapter-Cable/dp/B00NH11X64
its an Hdmi to dvi cable.
Use this to get the display it should work fine if the resolution on the ps3 is set to 900p or less.
but now you need to get sound i used to get sound by connecting the standard ps3 rca (red,white and yellow cable) to a jack that was giving to my speaker/headphone something like this:
http://www.amazon.com/CableWholesale-3-5mm-Stereo-Adapter-Female/dp/B000I98ZM8
so here you go.
What we are doing is getting sound and display separately. Display from Hdmi on the ps3 and sound from the rca connector on the ps3.