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I've been having this problem since a few days ago.
It just automatically disables the internet when an external hard drive is plugged in, and as long as it is unplugged, everything returns normal.
Any idea how to fix this please?
MacBook Air, OS X Yosemite (10.10.2)
Is this a USB-3 external disk?
A poorly shielded USB3 disk enclosure/cable can generate very intense 2.4GHz interference. If you are using 2.4GHz WiFi, this could be your problem.
See this intel White Paper
Is this a USB-3 external disk?
A poorly shielded USB3 disk enclosure/cable can generate very intense 2.4GHz interference. If you are using 2.4GHz WiFi, this could be your problem.
See this intel White Paper
If your Wi-Fi source is capable of it, try setting up a 5GHz signal.
MacBook cannot connect to wi-fi when my hard drive is plugged in
