So I was attempting to go to Macrumors.com with the latest version of Safari on 10.9.5 Mavericks, and I think the URL was that of which couldn't really be loaded (was using the pre-loaded history from the URL bar, just a random Macrumors URL so it would get me to Macrumors instead of typing it all out) and Safari gave the errors of something along the lines of "Something went wrong/there was an error loading this page" - Safari attempted to load the page three times consecutively, one of the other, then gave the errors. I quit Safari, then when I attempted to start Safari again it just kept bouncing in the dock, then beach balling happened, and the whole machine more or less locked up. Had to be cold rebooted. This all happened on a 2009 27 iMac BTW. If specs would helpful I'll list them. Any ideas as to why this may have happened? Has anyone experienced anything like this before? Thanks in advance! UPDATE - It just started doing this when I was using it normally. Started beach balling then had to be rebooted, cold. Now the fans are spinning up as well, eve after restarting it. Mods - I made a thread like this in the 10.9 section of this forum, please delete that and leave this one. Thanks. Any ideas what could be the cause?