WiFi drops (DNS) when plugging in charger

Question

WiFi drops (DNS) when plugging in charger

Hi there,

Whenever i plug in my charger on my Macbook Air 11", my Wifi just blocks. Not only on my macbook but on everything. It somehow does something to the router. I have no idea what. I had my ISP's mechanic come over a couple of times to check if it's something on their side but it's not. I can't find any similar problems on the net. And i checked everything. All settings are good. But only when i plug in my macbooks charger, it messes with my router and suddenly it says "Resolving host" and the DNS is lost. Even tried using different open DNS adresses. Nothing helped.

MacBook Air, OS X El Capitan (10.11.3)

Posted on Feb 25, 2016 12:19 PM

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Answer 1

my ginger

Level 5

4,928 points

Feb 26, 2016 9:32 AM in response to renefromcothen

Is the magsafe getting overtly hot? You could use about this mac/systems/power to see what voltage it is putting out. Should not be over 12500MV. https://support.apple.com/en-us/HT203207 You could also try a SMC reset. https://support.apple.com/en-us/HT201295

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Answer 2

Feb 26, 2016 9:44 AM in response to my ginger

Temperature seems normal. Voltage is on a normal level as well. Did the SMC reset and still have the problem.
Plugged in my connector and "BOOM" off went the internet on all my devices (WiFi and cabled).

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Answer 3

my ginger

Level 5

4,928 points

Feb 26, 2016 10:01 AM in response to renefromcothen

Do a pram reset. https://support.apple.com/en-us/HT204063 When you say plugged in my connector. Do you mean ethernet cable or magsafe? If you are running, wifi only, from your Macbook Air I do not see how that can shut down the internet completely thru wifi. Unless you have a problem with the wifi card. What happens if you turn off the wifi and run by ethernet cable?

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Answer 4

Feb 26, 2016 10:55 AM in response to my ginger

Did the reset and no succes. I mean the powerconnector. I don't use the ethernet on my macbook. And i don't own an ethernet connector (no use to buy a laptop if you need one).

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Answer 5

my ginger

Level 5

4,928 points

Feb 26, 2016 11:17 AM in response to renefromcothen

I use ethernet when I am at my desk because the internet speed is better and more reliable. The reason I asked about trying with ethernet was to see if you get the same results. If not you could have a bad airport card. Since you have no problem in wifi when on battery only. It doesn't sound like a bad configuration on your computer. You could go to the utilities folder, activity monitor, and then plug in the magsafe to see under power and internet if you get a spike. You may still need to take it to the genius bar to be checked.

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