ram not working

Hi, there's a problem arises after 1 year and almost 6 months, that is my 4GB Ram is not working. I know the problem, which is I was using 1600mhz ram on my i5-second generation laptop. Two rams were attached, first is 2gb 1333mhz and second is that 4gb 1600mhz. But can anyone tell me why it...

I want to know what is the problem with that message (check black box) and how can i remove it. http://img.techpowerup.org/140823/Capture004600.jpg

Hello this is my second time on this thread and i had this question itching because you guys probably know the answer to this. What graphics card can i be that'll work with a pcie 1.1 and 300 watt psu. Something that gives the most kick for it's dollar. I have an intel core 2 duo 2.5 ghz and...