Have you gone into the BIOS? You need to check that the RAM values have been read by your MB as they are supposed to be. For now, do not try to OC at all, just use stock settings. Make sure you get all the main ram timing values, ( ex. 11-12-11-27 ) and make sure the voltage is correct. Are you using the stock value? I just went to Intel's site and they don't seem to show the voltage??? Anyway, is the G Skill the same voltage and spec as your old RAM?
Here is the Intel site page for your RAM info:http://www.intel.com/support/motherboards/desktop/dh55pj/sb/CS-031469.htm#tested