Connection Ethernet to El Capitan does not

I've updated El Capitan on my Ethernet connected desktop computer on October 2, 2015.  Then on October 22 the 10.11.1 updated.  On November 6 and 7, I was unable to connect.  I managed to get back online in the evening of November 8.  don't ask me how! This last until 19 November.  Then from November 20 to November 26 inclusive.  On November 27 I connected as a guest and managed somehow to connect again.  Until 30 November and have been offline since with my office. I give these dates because I want to eliminate two potential problems:

1. on 8 November, I joined a new wireless Brother printer all in one

2. on 16 November, I received a new Panasonic microwave oven.

my ISP is Plusnet.  I contacted them, and the answer that seemed logical, is that I have an iPad and iPod touch that I can't connext with Internet.  So there is nothing wrong with my line.  It must be the iMac system.  PlusNet has confirmed that I have the correct details in the account preferences.  I have another e-mail account that is iCloud.

I tried everything I have seen online including discussion forums.  I'm desperate to get online on my desktop.

is your compatible 802.x microwave oven and it is in conflict with your router?

Probably not.

If you have restarted?

Have you tried another cable?
The ends of cable even turn on?

go to  > System Preferences > network

Disable the network of preference by choosing configure IPv4 to Off,

then turn on again.

Do you have a usable network address?

Haven't you address

Do you have an 169.x.x.x address?

Your ISP provides you with their own address?

At your rebooteted your modem router/hub/cable modem/DSL?

Are you running any 3rd party 'utility' that 'clean up your mac' or any what "anti-virus" or any firewall or network utility?

If so delete them immediately as shown in developers.

Have you removed (use the "-" on the interface) and recreated the Ethernet connection?

Tags: Mac OS & System Software

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