el capitan upgrade problem

Hello, I am quite the techie .... in the Windows world so my friend asked me if I could upgrade his Mac Mini (late 2009 version) with an SSD drive and some RAM. I said sure, I mean how hard can it be? Well, I am stuck. I tried all I could find on forums, YouTube etc... Nothing works, for me at...

I have a 2012 Apple Mac Pro "Quad Core" 3.2 computer with 12 GB of RAM. I'm reluctant to give the thing up because I love have 4 SATA bays that I can use for swapping drives easily. Running under the latest version of Yosemite, the computer can get VERY slow, particularly when a background task...

I have been enrolled in the El Cap public beta since day one, but at some point I stopped receiving updates for it. I am currently on OS X Version 10.11 Beta (15A278b) on a MacBook Pro (Retina, 15-inch, Late 2013), 2.3 GHz i7. I have done all the normal things one would do to prompt an update...

I updated my iMac to 10.11.2. My primary account works fine and has administrator access. My wife's account won't log in (it just gets a spinning gear, forever). This same thing happened when I went to 10.11.1. I had to do a clean install and migrate from my bootable backup to clear the problem...