Hello, i'm new in this forum =)

Have a two problems...

I installed in my pc iAtkos v.5 with Broadcom LAN driver. (440x)

The problem is, when boot, the leopard cannot lan internet next, so.

Can help me?
Sometimes have a internet.
I tried retire the cable of ethernet, I backed plug nothing...
Rebooted the system... nothing...
But, sometimes has got internet!!
I cannot undestand

My pc is:
Acer aspire 5610
Nvidia 7300
3 GB RAM
Broadcom 440x