Why does my ram is not working

Why does my ram is not working I have a 4gb Kingston ddr2 ram and 1gb ddr2 ram.If i insert them into the mother board ,when i starts the system the display shows a blank screen ,if insert it after starting the system the system hangs plz say any easy solution to fix these problems
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Guest [Entry]

Many systems require that the first two memory cards to be twins. In others words you would need either 2 DDR2 1G memory cards or 2 DDR2 2G memory cards. But it usually doesn't even detect two non-twin cards so sorry about that. Also some memory cards are computer specific so you will need to check the specs of whatever system you are trying to put the memory cards in to see if they are compatible.