Satellite L750 - network card on, Led ligth off

Hello.
Satellite L750 -> Laptop network card connects internet but led light off ?
Thanks

Thanks Jacky,
+What network card and what LED indicator do you mean exactly?+
Network card, RJ45 port (i think it's atheros ethernet gigabit)
+Do you mean WLan card and WLan indicator?+
NO, no Wifi. Lan card, and Lan indicator on RJ45 port
+Are you using Toshiba preinstalled system?+
Yes
I have internet connection on RJ45 port (cable) but the Lan indicator is OFF
Thanks

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