Pc ATI radeon hd 3870 in mac pro 1.1 (monitor shows no signal)
Mac pro 1.1
2x 2.0ghz quad core xeon
20gb ram
OS X 10.11.6 el capitan
I bought a second hand PC graphics card (ATI Radeon HD 3870) as far as I'm aware any pc video card should work just fine with out a boot screen unless it's been flashed. I removed my old video card (nvidia geforce 7300) and put my new card in the same slot, connected the 6 pin power cable and plugged in the monitor lead. Powered on the mac and got nothing from the monitor, mac still chimes fine and as far as I'm aware is still booting up fine, but the monitor is still on standby. I put my old video card back in to another slot and kept the new card in as well. When I booted it up connected to the old card, it came up with the expansion slot utility saying there was two video cards installed and that the new card was running fine. when I open system information and go to graphics and displays it also shows there.. does anyone have any ideas why the monitor isn't picking up the card? I have photos of the screen shots, but too big to upload Any help would be very much appreciated. Thanks