I hope you can help me. I had modest tech abilities until 6 months ago, when I had a stroke. I don't know now what these abbreviations mean. I have read the answers but they don't seem to apply.
My mini got a new hard drive last November with Mountain Lion installed. I think I wanted to upgrade to Mavericks but somehow got Yosemite instead, which is awful and messes with everything. Can I get rid of it without losing everything? I don't have anymore an external hard drive, or something else I can't recall. Thank you.
Source: Delete Yosemite? Find Mountain Lion? Post-Stroke Explanations, Please
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