Graphic Cards Problem of XFX ATI 6570 card feeding my Onkyo hts 3400

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Hi friends,
I have XFX ATI 6570 1gb card,windows 7 os installed in my system.Prime use of this card is HTPC I was using this card for the past few months for feeding my Onkyo hts 3400 home theater system using hdmi cable.But last few weeks there is some problem so windows 7 could not detect my home theater it shows Realtek HDMI output (ATI HDMI audio - not plugged in).I uninstalled all the drivers
AMD catalyst control center,Realtek audio driver ... and even uninstalled ATI HDMI audio,Realtek high definition audio from device manager and installed the drivers again but no luck.Today I even installed latest driver from amd 11-10_vista32_win7_32_dd_ccc_enu.exe but there is no improvement.Few days back I used another hard disk which is used for back up (windows 7 installed ) is feeding my home theater without any problem.What went wrong with my active hard disk's operating system.I am not willing to reinstall windows7 because it consumes time to do that.So please help me to solve this mystery.

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Chaos said:
Remove all realtek drivers and just install the ATI HDMI driver. That is all that is required. No realtek crap needed.

you mean 11-10_vista32_win7_32_dd_ccc_enu.exe or HDMI_R264.exe(which is downloaded from realtek site and showed as "realtek high definition audio driver" in revo uninstaller. I feel tired of trying various combinations with drivers.I got this link while searching internet but amd provides this for windows xp only (http://support.amd.com/us/gpudownload/windows/Pages/hdmi_xp.aspx) and it provides only Catalyst Software Suite for windows 7 there is no link for "ATI HDMI Audio Driver" under individual downloads.
 
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