I have a laptop with a Broadcom 440x ethernet adapter which isn't working.

I've followed all sorts of advice in this forum about replacing IOPCIFamily.kext and IONetworkingFamily.kext and all that, and the card has been detected by OS X - I can even see its MAC-address which is the same as in Windows XP - but its led's aren't turned on and I get no IP address using DHCP.

The ethernet adapter works fine in Windows XP.

I have no idea where to start debugging - can someone point me in the right direction?

same situation ere, but my led is both on, yellow and green , I didn't do anything about change etension until now, becaure I rmemnber it suported native...

this may or may not help, when exiting windows do you restart to mac or shutdown and then start mac? this was always my problem, whenever I restarted from windows and even if I kept restarting from mac the ethernet wouldn't work, but the minute I powered down the computer and started it, everything worked fine!

sorry for my bad english, but i didn't undertand too well..you say that I have to start windows then halt windows, and after I can restart mac and everything goes well??
thanks for your patience.

it's a known problem.. seems windows doesn't turn off the nic correctly, so you need to completely turn off the pc if you want to switch from windows to mac os

Cool, I'll try that out!

so I have to log in win , shutdown it, leave the battery out , then reinsert it ,and my mac will ok agan??

..I'll try later, 'cause I,ve just logged in vista, shut down it , relog in mac , no difference at all!!

i just recall something i've read, i do not own that nic

.......nothing at all , "The cable for Built-in Ethernet is not plugged in" even after tried with log o vista and swith the power off in a wild way....