Unplugged my modem and now Internet has stopped working

[Michael_293]

I'm getting a message that my '"Ethernet" doesn't have a valid connection' after I unplugged my modem for a bit. What would be a reason/fix for this?

 

[Ralston18]

What was the original reason for the unplugging? Was there some error or problem at that time? Are you sure that the power connection to the outlet is good? Check all of the power connections.

It can take time for all network devices to reconnect and establish a working environment.

Do you have a modem/router or modem and router setup? Make and models? Do you have the User Guides/Manuals? Reason: The manuals will explain the led status lights which in turn will provide some insight as to what is (or is not) happening.

First check that all network cables are fully and firmly connected.

Try turning everything off for about 10 minutes. Restart the modem and wait about five minutes. Then restart the router and again wait about 5 minutes. Then use just one device to check if your network access and internet access has been restored.

You may have to make a couple of attempts and wait for more minutes between restarts.

Trusting, of course, that you did not do any factory reset by pushing and holding buttons, etc..

If that is the case then you will need to completely reconfigure your network as if the modem and/routers are a new installation.

 

[Michael_293]

I plugged the modem because I was cleaning my room. No issues before that. Power connections are fine.

I have a router, a TP-LINK. But the problem persists even after I plug the modem directly into the PC. The modem itself was sent to me by my ISP, AsahiNet. The manuals are in Japanese.

The cables are connected.

I've tried doing a power cycle.

I've tried just setting up a new connection with the username and password that my ISP provided me.

Do you it could be a problem on my ISPs end?

 

[Ralston18]

At this time, I would certainly consider giving the ISP a call. They can check things from their end.

Just double check beforehand that you did not accidently loosen up or disconnect some other connection: ADSL/telephone or coax cable as applicable.

Verify the connection path. E.g.:

ISP ----> Modem [Ethernet port]----Ethernet cable --->[WAN port]TP-link Router [LAN port] ----Ethernet cable ---> PC.

Swap out cables with known working cables if at all possible.

And directly connecting to the modem as you have done is a valid test but the PC's network adapter must be configured accordingly.

Difficult with a foreign language manual being involved.

Go online (as you did to reach Tom's Hardware) and look for an English language User Guide/Manual for your modem. Check modem for model number, version, serial number, etc. to help find the correct manual. Goal is to at least find some explanation of the LED status lights etc. on the modem. May well indicate the source of nature of the problem(s).

Even if the cables appear to be correctly in place, disconnect and carefully reconnect. Coax connections can be tricky on a new device. Screws on, or seems to, but it may take a couple of tries to go on squarely and securely.

Remember to check any wall outlet connections and splitter (filter) connections as well.

When you call the ISP be prepared to go through some combination of shutdowns, and restarts.

 

[Michael_293]

It was literally just the phone line connection into the wall as it turns out - it was very slightly loose so nothing was connecting. All that hassle for such a small thing!

Thanks for all the help though.