Hey! It sounds like your Ethernet connection isn't working properly. You're seeing much slower speeds than expected, even though you think your ISP is fine and you have different cables. Since the router is downstairs and you can't easily change it, here are a few things to check: make sure the cable is properly connected, test with another device to confirm the issue isn't with your network, and verify that your computer's network settings are correct. If the problem persists, consider checking for any firmware updates on your router or contacting your ISP for further help.
You have the option to operate the PC using Wi-Fi or swap out the faulty cable. Inspect the cable for any visible wear or damage. Was this issue emerging recently?
I’m unable to operate this PC over Wi-Fi—it simply won’t work, which is why the cable was needed initially. I can’t inspect for physical damage since it’s routed through a conduit all the way from my router downstairs into the space where my PC is located. This problem began last night, and I have no clue what might be causing it.
The cable is operating at a certain speed, and you're checking real bandwidth performance through specific verification methods.
Is this what you're referring to? I notice the Ethernet connection is very slow, almost unusable, while another site shows a stable speed of 30MBPS.
I can look at the cable and see if it connects to the back panel, then trace where it goes into the wall, raceway, or mouse hole.
Navigate to Device Manager, find your Ethernet adapter, and adjust its properties.