It is sad to know you have issue with your new laptop.
Please make sure the Ethernet driver is installed and the lan cable is fine which is connected to the Ethernet port.
If the issue persist then I suggest you to contact the support center.
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if the modem or router your rj45 is plugged in to is not working, the lights on the v570's rj45 port won't light.
_________________________________________________________ IdeaPad V570-1066A9U, Built 5-22-2011, BIOS 44CN36WW(2011-08-04) Win7 Pro x64 clean install. Sammy 840 Pro 128GB SSD. Fast! Used nice hardware manual to re-grease CPU and remove tiny bit of lint.