RE: Just "installed" Radeon R7 250 graphics card on my Dell Optiplex 9020. Black screen when I plug the monitor into the card. Help!
most r7 250 pull max about 60-65w of power so that shouldn't be the issue unless it's the overclock r7 250x that needs the 6 pin power plug. black screen leads me to think it could be the BIOS is still set to only use on board APU ... on my new Inspiron 3650 i had to go into BIOS and tell it to use the card because it was set to use the on board APU only by default.