OK so I'm having real weird behaviour on my 2011 base Mini. I have it booting from a 128GB PNY SSD drive running in a Seagate GoFlex Thunderbolt adapter. It has worked just awesome for almost a year. Just within the last few days I've been having all sorts of issues to the point that now it doesn't even startup if I select that drive as startup. What has been happening is it started with tons of Safari errors where the pages would just keep reloading until finally it would never reload. I was also getting kernel panics, and it would not even shut down properly without pressing the power button. Thinking I had a corrupted OS X I reverted to a Time Machine backup from a few weeks ago when I had no problems at all. Didn't help things at all same issues. I tried to install the latest OS X update but it shuts down and restarts when it installs. If I boot from Yosemite on the internal HDD the machine seems to run better but I'm still having problems. Such as Plex server not starting. Where should I start troubleshooting? SSD? Other issues? I reset SMC and NVRAM.