cant connect to local area connection on home network? windows 7?

I have an hp computer desktop with windows 7 (x86) and it is connected to a linksys router via an ethernet cable that is connected to a modem...for over a year the internet and everything else has worked fine...nothing new installed..last week i was on the net and all of a suddent the connection went off...i didnt install anything new or change settings...in network and sharing center it says...unidentified network public network no internet access..and there is a yellow triangle with ! on the bottom...also i have 2 laptops and a desktop that are wirelessly connected to the router and the internet on them works just fine...can you throw every possible solution at me...i have tried every suggestion i could find...from diabling and reenabling LAC adapter...disabling and updating LAN adapter...but nothing works...i unplugged my router and modem and shut down the computer..restarted everything but nothing...something interesting is that when i tried renewing my ipaddress via ipcong ..renew/release it saidmedia state disconnected...and renewed it but then syas an error occured...unable to contact DHCP server..also i am 100% sure my ethernet cable is fine b/c its connected and i tried it on another laptop with the same router and it worked flawlessly ..plz help..

2010-06-24T20:34:18Z

pinging works fine i get a reply with nothing lost and i also tried entering those things manually but still the same result..if it helps before i could see my network name and home network to connect to..now its simply unidentified and not connection

Anonymous2016-04-12T14:40:39Z

POWER OFF Devices in this order... 1) Computers.. (Main PC Last) 2) Router 3) Modem Wait.. 3 Minutes... POWER ON in this order... 1) MODEM - wait approx 10 - 25 secs.. for connections and lights to kinda settle before Powering On the next device... 2) Router - wait approx 10 - 25 secs.. for connections and lights to kinda settle before Powering On the next device... 3) Computers (starting with Main PC) - wait approx 10 - 25 secs.. for connections and lights to kinda settle before Powering On the next device...

ih8u2010-06-24T20:12:25Z

Have you tried entering your IP, mask, and default gateway manually?
Have you tried pinging 127.0.0.1?