Only boots with 1 or 2 DIMMs. Only recognizes one

[rizz24]

My computer will only boot correctly if I have 1 or 2 sticks of RAM in. Motherboard has 4 slots, A1, A2, B1, B2. I have 4x4GB DIMMs. It only passes post and boots if I have a stick in either or both B slots but won't even boot if I have anything in either A slot.
I've updated my bios, loaded XPM profiles for them in the BIOS. All slots are enabled. Even when I boot up with two sticks in, my computer still only recognized 4GB. The RAM came directly from the motherboard's list of qualified products. RAM is G.Skill Ripjaws X F3-14900CL9Q-16GBXL and MoBo is ASUS P8Z77-V Pro

 

[rolli59]

A2 slot is the default slot for single channel, have you tried that with all modules individually?
Next slot is B2 for dual channel with two sticks.
It is possible that 1 or 2 of your sticks are bad but then again it might be the board.

 

[rizz24]

Yes, I have tried each individual stick in each individiaul slot and those were my results

 

[smorizio]

i have a z77 sambertooth that has two dead slots..another guy on asus rog this has happened too. the tech on rog said for me and the other guy to rma the board back to asus or to where you baught them..just check the cpu and pin on the mb when you do the rma.

 

[rolli59]

Yes, I have tried each individual stick in each individiaul slot and those were my results

Looks like a bad board!