From everything I looked at, these two should be compatible, but maybe I'm missing something as all I get is a black screen (checked the seating multiple times, it works with other RAM, just not with them combined or with new RAM on it's own).
It's a M4A77TD and Corsair XMS3 1333mhz 2x4gb CMX8GX3M2A1333c9
Appreciate any advice people have, or I'm gonna have to find out much more about Amazon's return policy than I ever wanted to lol.
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I think it is the RAM problem, I know some of ValueSelect and XMS is very picky. If the PC will not boot while you use those RAM, then you are better to return the RAM.