After installing the XFX R7700 and when starting my Gateway DX4870, the screen is totally black until the start windows 8.1 appears. Nothing haapen even I hit DELETE or F12 after the first bip.
Have you tried updating the Motherboard bios to the latest revision?
How is the GPU connected to the display?
I connected the GPU to the monitor using DVI and TV via HDMI. My niece took the computer to her apartment. I'll try to update the BIOS when she comes back.
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