Wireless internet up, PC internet down
August 25, 2012 6:08 PM   Subscribe

My wireless internet works fine. My PC, with ethernet line to same router, has no internet connectivity. What could be happening?

A week ago, my Windows PC, connected via ethernet cable to my router, started intermittently failing to connect to the internet. Refreshing the IP settings via the diagnostic tool fixed the issue each time... up until Thursday. Since then, I've rebooted, rebooted the modem, checked the plugs, reset the adapter, changed ethernet ports, and nothing's worked. This while my wireless internet hums along just fine on the same router. Virus scans on the PC come up clean. Any thoughts on what it could be? I'm not much of a networking expert, so small words, please :\
posted by ormondsacker to Computers & Internet (12 answers total)
Have you tried another computer via ethernet?
posted by one4themoment at 6:11 PM on August 25, 2012

Try safe mode with networking or a linux live CD and see if you can get online.
posted by wongcorgi at 6:19 PM on August 25, 2012

Response by poster: Oh, good question... Yes, ethernet connection works just fine with another computer.
posted by ormondsacker at 6:21 PM on August 25, 2012

Do you have MAC filtering set up on your router? I have encountered some routers that will bizarrely forget some computers' MAC addresses for no apparent reason but not those of the other computers.
posted by XMLicious at 6:31 PM on August 25, 2012

Response by poster: Tried wongcorgi's suggestion of safe mode with networking, and it works. I am online in safe mode. What now?
posted by ormondsacker at 6:46 PM on August 25, 2012

Maybe delete in device manager and let the computer reload the drivers on reboot?
posted by one4themoment at 6:50 PM on August 25, 2012

Try different web browsers if you haven't already. Sometimes there are issues that affect one web browser but not another.
posted by XMLicious at 6:57 PM on August 25, 2012

Have you done any offline scans? AKA AVG Rescue CD et al?
posted by one4themoment at 7:04 PM on August 25, 2012

Best answer: By chance, do you use McAfee? My mom had a similar problem earlier in the week that turned out to be caused by a McAfee update. She uninstalled, then reinstalled and seems to be fine now.
posted by Sweetie Darling at 7:14 PM on August 25, 2012

Best answer: I have seen McAfee, Norton and Trend antivirus products break networking this way. So if you're using one of the Big Three, try uninstalling it. Then check out Panda Cloud Antivirus Free before reinstalling.
posted by flabdablet at 7:31 PM on August 25, 2012 [1 favorite]

Response by poster: Yeah, problem solved, and I am long, long overdue, flabdablet. Thanks, all.
posted by ormondsacker at 8:00 PM on August 25, 2012

So which was the culprit this time?
posted by flabdablet at 4:10 AM on August 26, 2012

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