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When I connect the the monitor to my PC using DVI, the output looks good. But when I connect the same monitor to the same PC using HDMI, the output is absolutely horrible - the picture and text comes out to be very grainy.

I am trying to use it for 1920x1080 (which shows up as the "recommended" option)

Here is my video card Sapphire HD 6850 PCIE Video Card (100315L)

enter image description here

How do I fix this?

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Does your video card have separate digital paths for DVI and HDMI, or do they come from the same source? – Ignacio Vazquez-Abrams Oct 23 '11 at 1:08
Which OS? What's the native resolution of the monitor? What's the resolution you are attempting to use? – Ƭᴇcʜιᴇ007 Oct 23 '11 at 1:53
Is it possible your HDMI cable is damaged or that it's a problem with the monitor's HDMI input, not the video card? Try it with a different computer or different cable, if you can. – nhinkle Oct 23 '11 at 4:39
Is the one that's giving you trouble the one that connects to the motherboard? – David Schwartz Oct 23 '11 at 5:16
It happened for me before when the scaling or overscan setting is incorrect. Try to disable overscan if possible. IMHO DVI is much easier to work with because the video driver treats the output as a monitor (instead of an HDTV) by default and there is no need to tweak these settings. – netvope Oct 23 '11 at 17:43

Does that happen for all content, or when playing protected content only. It could be Windows not detecting the monitor as HDCP compliant (not able to perform HDCP handshake between the source and the display) and downgrading the video to low definition.

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