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Thread Starter 
Hi everyone,

I have a core duo Macbook, on which I recently upgraded the airport card. The original Atheros one was not that good so I upgraded it to the Broadcom BCM94321MC from a Mac Pro. Install went well and it seemed to have an improved range even for 802.11g networks.

However, it seems to randomly go to sleep, the airport card is listed in the system profiler but is switched off on the airport and network menus. The only way to get it back is to restart the Macbook, it will not click back on and logging in & out have no effect. I have tried resetting the system management controller and the PRAM.

Anyone have any ideas?