I changed graphics card and now 'sata primary drive 0 not found press f1 to continue etc comes up'?

agp card, the card that was in radeon 9800 and used a cable to connect but there is no place for a cable to go on new card, when i press f1 i hear a sound and same line pops up, i-at the advice of the guy in the shop uninstalled the driver tha was in there and an atp thing, dont know much about this stuff any ideas what i can do thanks