OK, but you still need to know which .kexts made them work... Does D-Link make OSX "drivers" ( an installer... ) for that network card? Did you check their website?

OOPS! Like, right HERE:

http://support.dlink.com/products/view.asp?productid=DFE%2D530TX%2B

If the audio card is "detachable", you should pull it briefly and look at the largest chip - see if you can get the markings off it - Manufacturer & etc. (like Realtek, or C-Media, ADI, and if there's a model number - not for the card itself, for the chipset) You probably need to know exactly what sound chipset is used to find the proper .kext or installer.

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Running both 10.5.8 and 10.6.4 on my stinking AMD/ATi machine...