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    Laptops laptop graphics card replacement

    i have HP DV-6516tx laptop (nvidia 8400 gs,C2D t5250,quanta 30D2 mobo) i was using this graphics card by overclocking it..... recently my graphics card was damaged due to over heating .... please tell me if i can replace my graphics card ..... and if it is possible recommend me where i can...
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    PC Peripherals 4GB of RAM installed, but Win 7 32bit only showing 3GB ?

    i have HP laptop(core2duo T5250) i have 4GB RAM but,due to win7 32 bit ,only 3 gb is shown in task manager. how can i use all 4GB ,with 32 bit.