Can't connect to Ethernet or Wireless internet with my MacBook

Hello.
I got a problem with my new MacBook. Every time im connecting it to the internet, the status of the internet connection turns yellow. This happens both with Wireless and Ethernet connections. Sometimes its working for like 10 minutes, and then it doesnt. After it's off the internet once again. All the other computers can't connect. Its like it can't get its own IP-adress. It steals the Windows Ip-adresses and then they cant connect to the internet.
Anyone able to assist me? Or should i call Apple?
Sorry for my bad english, im not pro at it yet.
Regards,
Martin from Denmark.

Are you using a router? If not then only one computer can be connected at a time.
If you are using a router, have you added your computers MAC address to the routers Access Control List?
Does your router have a setting where you can limit how many computers can be connected at one time?
Are you using an Apple Airport Base Station as your router or some third party router? If it is third party you would need to ask the router manufacturer how to add the macbook to your current network.

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