New MacBook Pro lost internet connection

Fortunately brought my MacBook Pro retina display 15 "and connected to a Dell monitor. (Hours of hassle, but I have another question/problem).

After using it for a while, I lost my connection to my home network. But my older MacBook Pro 13 and my iMac 27 were still connected.

I took the new MacBook Pro 15 "at the kitchen. And here, I got my connection again.

So... WHY

And... WHAT can I do to keep my internet/network connection when my new MacBook Pro 15 alongside other computers?

AND... Is there a use for my Airport Extreme, when my DSL provides internet and network?

No use of Airport Extreme is not mandatory

I use Dlink router and modem and all the Apple stuff in our home works very well

That said-

Press Option - then click the WiFi icon and click the wireless diagnostic tests - the process of

If nothing remarkable is found - let it run in the background as you go about your work

Also, when you do this - take a screenshot of the gray information and post a photo

Finally two points-

1. you have indicated this is a new device - is there sufficient numbers DNS for the tour of your router?

2. do you know if your router provides 2.4 GHz or 5 GHz of bandwidth?

Tags: Notebooks

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