I just put together a new computer and the screen is not coming on when the graphics card (Radeon 6870) is plugged in. The screen and graphics will work when the card is unplugged, using the graphics from the mobo. I'm using a RGB adapter from the motherboard slot, since I forgot to pick up an HDMI cable. I figure this may be the problem, because the graphics card only has HDMI slots. Main question is, the screen should work when I plug in a HDMI cable straight to card? Even if it hasn't allowed me to install the driver yet?
The graphics card is still connected to the motherboard. When the power cables are installed, black screen. When power cables removed, motherboard acts as graphics. I have a 700 watt power supply. Everything else works fine. I hopes its just the lack of hdmi cables.
make sure both 6 pin pci power plugs are plugged in and not just one.