i just attemped to upgrade our hp pavilion intel pentium dual cpu e2220 2.40ghz with an old grafic card i had in m last computer i had it working find untill i shut down the computer i took out the card and every time i try to start it up it starts for about 5 sec then shuts down with nothing on display tried putting the old card i took out back in and the same thing happens i really need help quick !!