I've already ruled out any bad sticks since I already tried swapping them all in the same slot (also ran memtest) I'm going to try having only one stick of RAM in and it'll be the DIMM slot that is giving me issues (The middle one.)
Also yes, I only have three DIMM slots. The 1st and 3rd ones are fine but the center one is the one that reads the RAM but doesn't allow me to use it.
Up'ing voltage on my RAM and changing it from 2T to 1T doesn't make any difference either. I tried changing the timings around a bit (bit slower) but also the no result.
I'm not an avid overclocker so I'm really just tinkering around places I probably shouldn't.
Thanks for your help, I really appreciate it.