Question Black Screen when adding new stick ram !

[waelattiadz]

I have TwinMos Ram and corsair one with the same speed and module ddr3 1333mhz , i have tried multiple times to put them together on my motherboard MSI H55-GD65 but im getting problems my pc is stuck at mobo screen and when puttting the twibmos ram alone pc keeps restarting without passing the boot screen , the corsair one is the old it is working fine when not adding that other ram and im trying to add new stick to it , when i change slots im getting a black screen .. is there any fix for this ot it could be ram is bad ??
my pc specs :
cpu : Intel(R) Core(TM) i5 CPU 661 @ 3.33GHz
ram : corsair ddr3 4gb 1333mhz
gpu : gt 730 ddr3 4gb
mobo : H55-GD65 (MS-7637)
ssd : TS256GSSD25S-M ATA Device
hdd : MAXTOR STM3160215AS ATA Device
os : Microsoft Windows 10 Professionnel

 

[Calvin7]

That kind of combination has no guarantee to work together.

 

[waelattiadz]

That kind of combination has no guarantee to work together.

Why ?