On your PC, try to connect again using the Ethernet connection.Ĭheck the network status in Settings. You can usually tell when they’re ready by looking at the status lights on the two devices. Wait a few minutes for the modem and router to fully power on. Plug your router back into the power source. Plug the modem back into the power source. If you had to remove the battery from the modem, put it back in. If you unplug the modem and lights stay on, remove the battery from the modem. Unplug the power cable for the modem from the power source. Unplug the power cable for the router from the power source. We have a separate group at work that takes care of the network switches, but if they come out and test that everything is alright, since our ethernet tool and a different computer (same model) worked fine, I was hoping somebody has some magical tap-on-the-back-twice-and-sprinkle-sugar-on-top kind of confirmed wizadry that's escaping my brain at the moment.Note: If you have a cable modem/Wi-Fi router combo device, you only need to follow the steps for the single device. I've had this same problem with different computers and locations a couple of other times, so I thought I'd throw it out there and see if anybody else has seen this and if there's a fix for it. I brought another computer there and was able to connect via ethernet, so that's why I'm so confused. I tested the data port with our ethernet tester and it says there's an active connection. The light on the NIC is off in the office where I get "Network Cable Unplugged" and on back on my workbench. It's not fancy or anything, but it gets the job done. Our network tool does check for an actual signal. Hope that helps or at least gives you some ideas. I'm not a network admin and my experience is limited to un-managed switches. Just remember that Ethernet Switches do fail. But they are still bad and will fail again. Resetting the power on the Switch might also temporarily fix it. Those bad ports might do that intermittently and might start working after disconnecting/re-connecting cables. Basically, it acts like the wire is bad or disconnected. When those go bad (usually only one-or-two ports at a time) the lights on both ends DO turn off and it says "Network cable unplugged". take a close-look at your Ethernet Switches. If you narrow it down to a premise networking problem (not computers) and the cables test fine. However, I don't think it says "Network cable unplugged". On long runs (or poor cables) I have seen Gigabit-capable machines try for a 1000 connection and then give-up (instead of falling back to 100). In that case, sounds more like a premise networking problem. Since you also have 9020's doing it, doesn't sound like a problem with the 7050's. does it check for actual signals or is it one of those little "2 piece sets" that just check that all 8 wires are connected and wired properly? see if the port-light on the Ethernet Switch and the little LED on the NIC itself are off. So, next time you have one that Windows complains about "Network cable unplugged". I'm a firm believer in ethernet wires for stationary machines (as apposed to WiFi). Thanks in advance to anyone that can help me solve this mystery! I've been working here for over 20 years and this problem has only happened the past year or so. Is there anything else that I'm missing? If it was just a one-off, I probably wouldn't care as much - even though I had to do double-work because I had to prepare a 2nd machine that will actually work - but this has happened at least three times with three different computers at three different offices. I tried upgrading the ethernet driver, rolling back the driver (if already updated), changing duplex settings, updating BIOS, rebooting, unplugging for a half hour and starting it back up again, etc. We've had a few other computers (different models one was an OptiPlex 9020) do the exact same thing and I just put them in a pile in my storage room until I can figure out what to do about it. I can plug in the original computer at some different offices and it works normally, but some others, I get "Network cable unplugged" and I don't know why. I work on another new computer out of the box, configure it at my workstation, and bring it to the user's office and it works fine. I bring the computer back to my workstation and it works perfectly fine. I test the data jack with my network testing tool and the connection is active. I plugged in the ethernet cable, but not able to connect, and it says "Network cable unplugged". I worked on a brand new one out of the box, configured it at my workstation as usual, and brought it out to the user's office. We have hundreds of Dell OptiPlex 7050 computers here at work.
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