I have GA-H55M-USB3 mother board. Old ram is Samsung 2gb 1RX8 PC3-10600U which works fine. I have 2 new ram of same model when I install 1 new ram(SP 4gb DDR3-1333) pc continously reboots.(can't access bios). when I install 2 new rams in the dual channel manner (2 white slots as mentioned in the MB manual) pc boots but after windows logo appear pc reboots (I can access bios this way). Would appreciate for a a solution