Asrock z97 extreme6 ram problems

Hi all sorry if this isn't the correct place to post but it seemed like it.
I have the asrock z97 extreme6 it won't go in dual channel mode but always worked in it before it's stuck at 4gb ram and won't post if I put a single 8gb gives errors either 53 or 55 the pins under a magnifying glass look fine I've tried a few other sticks all different ways also tried another cpu the same i5 as mine is there anyway to test slot 4 for my ram with a volt meter and if it's broke is there any way to find where the brake is along the board to at this point I'm messing with it rather than the bin getting it, it's never had anything done to literally worked 1 day 4 sticks in the next didn't