Network cable unplugged

I recently purchased a new PC, and after disabling the wireless network card thing, it has been working fine until today.
I found out my internet would crash randomly, and when I checked, it would say Network cable unplugged.
I know for a fact that the cable is plugged in because it would crash for around half a minute before reconnecting.
Here's a picture of what I mean.


I've googled the problem, and I've tried it all.
I've made sure the adapter is working, unplugged both sides of the cable and plugged it in, restarted computer, restarted the router/modem.
Anyone know what is the problem?

 

There could be multiple problems, have you tried the enthernet plug on a different computer? Try diagnosing the connection.

 

There was no problems when I diagnosed the connection.
I have tried it on a different computer, it worked fine.

 

Multiple problems

- Other people using your internet and unavailable of bandwidth/low bandwidth
- Signal problem - How many bars you get normally?
- Wires connecting your Wireless router to your modem could be faulty. I have a faulty wire, even if I step on it, it will get disconnected like yours and re-connect.

 

http://download.cnet.com/XP-TCP-IP-Repair/3000-2094_4-10410929.html

Try using that and see if it works.

 

Check your network cables to see if any of them have a short or whatever. I get that problem quite frequently, especially when make the cables myself.

 

Weird.
It has stopped doing that now.
I did nothing different, but it just stopped.
Thanks anyways guys.