Computer not booting up again after booting up with option key So I was attempting to install OSX snow leopard on my Mac mini from OSX sierra by shutting down and then booting up but holding the option key. If this is totally wrong I'm sorry, but I found it as a tutorial on I-can't-remember-where. Upon doing this it came up with what I believe to be the recovery screen. Anyway, I connected successfully to the proper wifi network, and clicked the little arrow under the "Macintosh HD" drive picture. My computer has been displaying the apple logo on a black screen for 2 days and 2 nights constantly running now. Is my computer ruined? What do I need to do to fix it? Can I fix it?

Side note: I did not change my software version. I am still running Sierra (if you can call it running)

Extra side note: I have a currently not corrupted backup of my computer, that I unplugged properly before this happened and I know it is still fully functioning. So even if everything gets deleted that is ok. I just need the thing to function.
So, it has finally loaded after a few power kills and restarts. Really hope apple fixes this bug soon. Very annoying.