Ok I'm running 10.5.6 on an (AMD) Aspire 5050 which has Realtek High Definition Audio which I used Azalia during installation and it worked. When I installed leopard the first time it worked fine but I had to reinstall for a number of reasons now I cant get sound to work for nothing. I've tried to install about 10 times and choose azalia eveytime and it never works.It doesn't even show in the system profile so its like it's not installing it. I downloaded the Azalia drivers from here and it gives me a panic message everytime. If anyone can help please I would appreciate it. Thanks

Try Whit this ^^

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Hello thanks for trying to help, I appreciate it but it didn't work. Nothing show up for any audio devices. STILL NO SOUND. I'M STARTING TO GET FRUSTRATED.

Put information of your audio device please and i try to search a solution for you

Another solution can be the OSX86Tool this program have a option to download drivers and install automatycally (And don't forget to erase the old kext before install new kext it may cause sound doesn't work)

Or follow this tutorial maybe can help whit your problem