Hello - I purchased a 2014 Mac Mini. I took it apart a few days ago to install a SSD. Everything seemed to go well. I installed the OS via WiFi and then upgraded to Sierra the same day. The WiFi worked fine the first couple days, but then today I went to put some files on the external drive I have connected to it, when I came back the WiFi wasn't working and it was turned off, which it was not when I left it. I went to turn on, but it tells me it cannot connect and perhaps my password is wrong. I ran the diagnostic, but that offered some very simple solutions like making sure it's on and I don't know how to read the diagnostic report the troubleshooter generated. I tried rebooting the Mini and the router, but neither worked. I don't think the card is working because it only sees the network I was using before, while my Windows notebook can see 10+ other networks. Is there anything else I can try to fix this? My Mini is under warranty, but the Apple store is far and I'm sure they'll frown on me taking it apart. Thanks for any help. --- Post Merged, Jul 16, 2017 --- It seems I should have done some reading before posting, cause I have an 8TB external drive hooked to the Mini. Once I unmounted and unplugged it, WiFi started working. Is there some way I can use the drive if I set it far enough away? Thanks again.