I recently bought a sapphire radeon hd 6870. when i first intalled it, it didnt work so i resetted CMOS and it worked. but everytime i turn on the computer the card wont work again so i have to restart CMOS again for it to work. I have installed all the drivers for it.
my computer is a dell xps 71000
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Have you changed your CMOS battery? It could be dying and not retaining the settings that default to the new card.