Asus Z87 ram issues

[Noble98]

So I have a ASUS Z97-A motherboard (link below) and CORSAIR Vengeance Pro 16GB (2 x 8GB). The problem is they used to work together, I sent the mb back to get repaired and now it wont work. Ideas why? Been like that since it got back. It will only work with one stick now.

MB:http://www.newegg.com/Product/Product.aspx?item=N82E16813132510
Ram: http://www.newegg.com/Product/Product.aspx?Item=N82E16820233600

 

[algorithmbreaker]

Try one 8 GB at a time and see if work individually on first and second slot of the four. If both 8 GB work one at a time, then memory is fine. Motherboard could be at conflict after the repair.

 

[Noble98]

Try one 8 GB at a time and see if work individually on first and second slot of the four. If both 8 GB work one at a time, then memory is fine. Motherboard could be at conflict after the repair.

I have tried that. I feel like it's mb but I need a computer for school as I do everything online