Network with the MacBook Pro 15 "problems

My new MacBook Pro (15-inch, mid-2015 retina) has 16 GB memory MHz DDR3.

2.8 GHz Intel Core I & and an AMD Radeon R9 M370x PCie, in addition to an integrated

Chipset Intel Iros Pro model. I am running OS X El Carolina Version 10.11.6, with 12 Parallels and Windows 7 for a few

the company's programs, but I mainly work on the Mac side.

An intermittent connection problem became constant after a week of using the computer.  My router DLink DSL (model 2750B) is two feet away from the computer.  In the system preferences / iCloud, I get "There was an error connecting to server Apple ID" my MacPro, iPad Samsung Galaxy S7 and Air 2 all connect with the same router wireless without any problem. (All my OTHER computers connected also with the same Apple ID and password without problem.  IMac 2012, MacPro, 2012 MacBook Pro, iPad 2 and the new iPad 2 Air)) I have a screenshot of the error message "None of your preferred networks are available" and in the same time to a list of all available networks, including my own.  Several times, I click on my network and get the response "the xxxxxxnetwork could not be contacted."

I solved problem with Verizon, my provider, yesterday, and the routine test found that I have an intense tone, but the computer could not complete the test routine.  I ran "Diagnoses" several times this evening - this is after 23:00, and the report suggests that I will review wi - if recommended (fact), that I have a crowded WiFi channel (almost anyone else is in the building at this late hour) and I have to reboot the router (I did several times) and that maybe I should join a Wi - Fi network network that is associated with the Internet (like mine that works for all other devices.)

Any suggestions on how to solve problems, or I would return the computer.  It's beautiful, and I spent a lot of time updating, installation, customization, before this stop of a Wi - Fi.  I had to buy a new router, but tests with Verizon made me doubt that a new router would solve this problem.

Thanks for all the wisdom and strategies.  Maggie2012

Hello maggie2012,

Thank you for using communities of Apple Support.

I understand your message that you are not able to connect your new MacBook Pro to your home Wi - Fi network. You did some great troubleshooting so far! I also recommend you to test the issue in Safe Mode and in an another user account on your Mac. The following articles will provide you with the steps necessary to test the problem in Mode safe and in another user account:

Safe mode

How to test a question in another user on your Mac account

Best regards

Tags: Notebooks

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