the installation of El Capitan suite

I have an iMac 27 "that has about 7 years. 2.8 GHz intel Core 2 Duo, 4 GB of memory. Before installing El Capitan, I reformatted the hard drive that had Snow Leopard top. I have all of my big (photos) files on an external hard drive, also all backups. I never had problems with gel with this computer at all.

So now I'm under El Capitan, I was looking for in the overview and here it says iMac (24-inch, mid 2007) is not my screen 24 "but 27"

.. but my real problem is that my computer is blocking almost every day while I am online, I use Safari. It's freezing to the point where I can see and move the cursor, but can't click on anything at all. No web-pages, not anything on the desktop or all files... nothing! to force-shutdown shortcuts do not work, I stop pressing the key. Once I just left it on until I left for the day and when I came back the screen was completely pixelated, but I was able to use the shortcut to restart.

My memory is 471,84 free to 499,25 GB

What could be the cause and what I could do.

Please post your report EtreCheck .  It is a tool of diagnosis developed by a contributor here, and it allows us to have an overview of your system, so we can advise you on what to do to correct what is the question.

Tags: Mac OS & System Software

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