Ram only works in two slots

[Daviiiddd]

Hi Guys,

I have a Gigabyte z-87 motherboard and 3 x 4gb sticks of corsair Vengeance 1600mhz Ram.

If naming the slots 4 3 2 1 instead of the actual order (im at work so I cant see my motherboard) ram will only work in slots 2 and 1, if i put any in slots 3 or 4 the system wont boot. Ive tried with a stick in all four slots at the same time and it wont work ... Does anybody know whats causing this?

 

[Y0GI]

Prolly bent CPU socket pins. Take out the CPU and examine the pins with a magnifying glass under a bright light. Or RMA the board.

Yogi