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My Compaq Presario CQ60 laptop with a dual boot of Linux Mint and Windows 7 is not connecting with my ethernet cable. Wireless does still work. The laptop does not connect through an ethernet cable at a friend's place also, so I think it is something with my laptop.

The facts:

With both Windows and Linux no connection possible.

On Windows the laptop does stay that a network connection is identified. After five seconds it then says that there is no access to the network.

The provider states that everything is fine although I did "lose a lot of packages".

While starting up the computer on the first screen on the upper left it says "Serial number not found" (this is new I believe)

Resetting the BIOS did not work.

Shutting down, removing the battery, waiting for 30 minutes and restarting did not work.

I hope someone can provide suggestions as of what can be wrong and how it can be fixed.

share|improve this question
Check your TCP/IP configuration. Did you specify an IP address? Maybe you assigned an address that is the same on both Wireless and Ethernet interface? – Ashtray Dec 23 '13 at 12:27
How do I do this? (And could this be the issue if both Windows and Linux do not work?) – Erwin Rooijakkers Dec 23 '13 at 13:02
1) Kinda obvious, but if you were using the same cable both places, try a different cable. 2) Examine the socket closely, and look for any damage. 3) Make sure the cable is going all the way in to the socket. 4) Try turning off the WiFi adapter, if you can. – Daniel R Hicks Dec 23 '13 at 13:32
And you ARE using a 6-wire cable in the RJ45 socket, right? Not a 4-wire cable in the modem socket? – Daniel R Hicks Dec 23 '13 at 13:35
The cable used to work fine so it is the right cable. Also using the cable of a neighbor with the same internet and cable (student flat) does not solve the problem. – Erwin Rooijakkers Dec 23 '13 at 14:29
up vote 1 down vote accepted

If you are getting link lights, then you can attempt to reset your ip configuration. Its simple but sometimes thats all it takes.

Go into CMD and run


once that runs


if that doesnt help run: ipconfig and see if it is giving a no media connected error or something similar. If it isnt the cable and the connection is set up fine it could be the hardware on the 10/100 port.

share|improve this answer
Thanks! I will try this once I get home. I found an old router at my parents' place which is a "solution" as well so the problem is solved. Merry Christmas. :-) – Erwin Rooijakkers Dec 25 '13 at 17:17

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