Screen goes black after installing graphic card

hi...i have install Asus Ati 5450 1gb graphic card on my pc...
3.0 ghz
dual core
2gb ddr2 ram
n asus motherboard...
after installing it when i restarts my pc the screen goes ma graphic card works on my friend's pc whose having ddr3 motherboard n i having ddr2 anyone hlp me plzzzzzzzzzzzz :(
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