New PCI card install

[Phil]

After installing a new pci video card into a compac presario desktop pc with onboard graphics I cannot make my screen come to life when attached to the new card. I have chosen to load from the PCI option at starup instead of the onboard option but it makes
no diffference. The desktop reconizes the pci card when I install it and I can choose it as my display but when I reboot.....nothing on screen
Anyone got a good idea ?

thanks for any info....