i have an old gatway fx7024 pc running vista home premium. it came with a geforce 8800gt card installed.

to make a long story short ...

i bought a nvidia geforce 210 card to replace the 8800. however, when i try to boot up with the new card, the pc stalls at the gateway splash screen. i've never changed video cards in a pc before and am stumped.

any ideas?

thanks in advance.