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?