Laptop won't boot with new RAM installed

[FloppyTacoes]

Hey guys, I have a Toshiba C55D-B5310 with one stick of 4GB PC3-1200S Samsung RAM. I bought another stick, a Kingston 4GB PC3-1200S to be exact. The only difference is between them is that the Samsung pre-installed RAM is 1rx8, while the Kingston is 2rx8. When I install it, my laptop won't boot, it stays on for a second before shutting off. I've only tried booting with both sticks, never tried with just the Kingston or switching slots for each stick. Is the Kingston just not compatible?

 

[quilciri]

what is the voltage requirement on the new stick of ram? the laptop you have uses low voltage (1.35v) RAM.

 

[FloppyTacoes]

what is the voltage requirement on the new stick of ram? the laptop you have uses low voltage (1.35v) RAM.

The RAM is 1.5v. I'll return it then, thanks for your answer.