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I realise this is an old post. I've searched for a dsdt patch that worked for a few days so the dsdt patch exerts published did the trick along with ###### 2.52 HDA kexts. I place my HDEF right under the headers at the top of the file right after the first mustache. I used DSDT Editor for MAC-WIN-LINUX which I prefer to two others i use. I like EVODSDTse fine and DSDT auto patcher as well. Asus P5G43T-M Pro has been difficult to work with but so far have a working Lion 10.7.4 system. So, thanks for your help. Asus P5G43T-M Pro 6300 Core Two Duo 4G Corsair DDR3 GeForce 210 card