Imac can't connect wired, but wifi works

Hellu!
Just bought a DSL-N55U modem/router (ADSL connection), seems to be a good one.
I'm the only one in the house with Mac, and I'm the only one that cant connect wired (LAN).
The other use windows and it works fine for them ..
I can connect to the router thru the wifi and it works. but i need to get online with wire.
Everytime i connect with wire
It goes online for 2 seconds, (The iMac gets a IP and internet works fine) but then it timeouts
and it repeats ...
So as soon i get online .. it kicks me out or something.
I have tried change a lot of router settings but nothing works.
I also tried to remove the network preferences and created new ones ..
Maybe i need to remove some settings or files on the iMac? i don't know ..
Please help!
I live in Sweden, and using a ADSL connection!

Change the ethernet cable to a new one, try a different port on the router. 
I did these but it doesn't work unless I unplug the router.
 Upgrade or re-install the drivers for your LAN card in the computer.
What is LAN card?
Why do I unplug the router then things will work? there should not be anything wrong with my hardware, right?

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