I have a mid-2009 iMac running El Capitan. The other day when I went to use it, it whirred for a while until it warmed up a bit but has been quiet since then. It has also started freezing at random times. Any idea what might be causing this? I don't want to lose all the information on it, so I started looking for a good used iMac desktop and saw a 27" iMac 2013 desktop running Catalina for $600. It's a nice machine, but I'd rather not spend on it if this one can be saved. Any thoughts?
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