Mac Pro 4,1 with Radeon 5770 upgrade audio problem

Today I installed the 5770 upgrate from apple. I bought it from amazon.co.uk.
I installed two cards, one on my 4,1 mac Pro and one on my old 1,1 Mac Pro.
The problem is that I lost the sound card on my 4,1. No audio at all. There is no sound card in the profiler, although when i run Windows 7 64 on bootcamp I can see the sound card, the drivers work but still no sound at all. I rolled back to my 4770 and everything worked as usual. The old mac runs perfectly with the new radeon.
Both macs run 10.6.7 fully updated.
I don't understand it
need help...

Hi There!
Same thing happened to me today installing a new ATI 5770 into a 2009 quad-core Mac Pro.
Simple answer: reset your PRAM.
There is a switch on the logicboard next to the RTC battery.
Shutdown the Mac with the 5770 installed, disconnect the Mac's power cable, hold down the reset swtich for 10 seconds, re-attach the Mac's power cable & boot the Mac.
If successful you will hear the "RAM is good" chime when booting.
Your audio device will now appear in System Profiler.
Enjoy your music!
Regards,
Dzzineer

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Apple Mini DisplayPort adapters: Frequently asked questions (FAQ)
http://support.apple.com/kb/HT3382
Guide to Apple graphic display adapters needed
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Atlona (Dual Link) DVI to Mini DisplayPort Converter for Apple 27-inch LED and 27-inch iMac
http://www.atlona.com/Atlona-Dual-Link-DVI-to-Mini-DisplayPort-Converter-USB-Pow ered.html
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http://www.alibaba.com/product-gs/337561577/miniactive_display_port_tohdmi.html
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http://www.apogeeinc.net/products/item.aspx?item=2745
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http://ca.startech.com/AV/Displayport-Converters/Mini-DisplayPort-to-HDMI-Active -Video-and-Audio-Adapter-Converter-Mini-DP-to-HDMI-1920x1200~MDP2HDS
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