Why my graphic card does not work?

my pc is http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01390641&cc=us&dlc=en&lc=en&product=3697231#N782


i only upgraded the 1gb ram to 2gb ram thats all
i bought this http://www.flipkart.com/powercolor-amd-ati-radeon-hd5450-1-gb-ddr3-graphics-card/p/itmd5vrzwe6g9qry?pid=GRCD5VRZZ9URJFXD

i uninstalled the intel card then restart my pc and reset the bios primary video adapter to pci e
i connected the card with monitor and start the pc but only cpu loads and it passes on to windows
but there is no display in monitor
but it works when attached to the old card
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