Problem with memory please help

[tartarsause]

Built a system, assembled it up but the memory didn't work so switched it out for another one. Worked til' entering the OS, got a blue screen and attempted to fix it with windows repair, still didn't work. It was in an endless cycle of blue screens. Switched out the RAM with another, and it then had memory problems, switched it back to the previous working ones and still had memory problems. So now it won't even start up. All in all right now its stuck with the memory LED lighting up red and not starting up.Help really needed.

Specs are i5 760, asus sabertooth p55 board, working ram was corsair dominator DDR3 1333Mhz cl9 and not working ram was OCZ platinum DDR3 1600Mhz CL7, psu is a corsair HX 750.

Really hope for a solution, thanks in advance.

 

[badge]

In BIOS, set the RAM's voltage, speed and timings to Mfg. specs. (usually written on the RAM). Try bumping the voltage up a notch.