PC will not boot with 2 sticks of ram (think i've tried everything)

lukehiggins908

Prominent
Nov 21, 2017
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510
I have a set of 2 new 8gb corsair vengence DDR3 Sticks (cmz16gx3m2a1600c10r) from a recent RMA with corsair (replacing the excat same sticks i brough back in june) now if i mount them both my pc will not boot to bios but with one stick it boots as normal. i have tried each RAM stick in each DIMM slot and all works if there is only one stick. when i first installed the sticks all was ok then i got a random BSOD for system thread exception not handled and now this happens - i am at my wits end - id like to know how i can better pin point the issue before i shell out money for new parts.

my mobo is MSI B85-G43 (not the gaming one)
cpu is intel i5 (i dont have exact info to hand)
nvidia gtz 970
600w PSU

i have tried what has been suggested in various other threads ajusted DRAM voltage in BIOS - manually set it to DDR3 1600 - there are no BIOS updates (i am on 3.9)
 

lukehiggins908

Prominent
Nov 21, 2017
4
0
510


Yep
Still no luck

Could it be a PSU issue? It will boot with both sticks in but with my 970 taken out.