Slow to inadmissible, is my iMac about to fail?

I have an iMac mid 2011, 21.5. Bought nine end 2012 so it is about 3 and a few years. Yosemite running. Was 4 GB, but I upgraded to 12 GB a few months ago. I've never had a problem with it until about 1/2 weeks to start my browser Chrome gel. I just opted for Firefox, assuming that it was a problem with that. I had previously attempted to upgrade to El Capitan in December, but for some reason any, that he wouldn't let me (it just stayed on break).

Now, since the last two hours, it is literally freezing whenever I click the cursor and give me the spinning wheel, so much so that I can't get in any system services to see if I can do something. I stop usually, but I tried to restart, it took 15 minutes to restart.

I know that's not a lot of information to work from, but I don't know where to start, if anyone can give any suggestions what to do or what you need to know to help please tell me, I'm panicking its 01:00, I did a recent upward, I'm out of AppleCare and there is no near me Apple store... I can't seriously afford to buy a new one or an expensive repair... I'm used to this kind of problems with the PC, fixing, but I have no idea what to do with my iMac, I never even had to think about before.

Thanks for any help

Save all of the data immediately, as the drive internal could be at fault.

When you see a beachball cursor or the slowness is particularly bad, note the exact time: hour, minute, second.

These must be run as administrator. If you have only one user account, you are the administrator.

Run the Console application in one of the following ways:

☞ Enter the first letters of his name in a Spotlight search. Select from the results (it should be at the top).

☞ In the Finder, select go utilities ▹ of menu bar or press the combination of keys shift-command-U. The application is in the folder that opens.

☞ Open LaunchPad and start typing the name.

The title of the Console window should be all Messages. If it isn't, select

SYSTEM LOG QUERIES ▹ all Messages

in the list of logs on the left. If you don't see this list, select

List of newspapers seen ▹ display

in the menu at the top of the screen bar.

Each message in the journal begins with the date and time when it was entered. Highlight date back to the time you noted above.

Select the messages entered since then until the end of the episode, or until they begin to repeat, whichever comes first.

Copy messages to the Clipboard by pressing Control-C key combination. Paste into a reply to this message by pressing command + V.

The journal contains a large amount of information, almost all this is useless to solve any particular problem. When you post a journal excerpt, be selective. A few dozen lines are almost always more than enough.

Please don't dump blindly thousands of lines in the journal in this discussion.

Please do not post screenshots of log messages - text poster.

Some private information, such as your name, may appear in the log. Anonymize before posting.

When you post the journal excerpt, an error message may appear on the web page: "you include content in your post that is not allowed", or "the message contains invalid characters." It's a bug in the forum software. Thanks for posting the text on Pastebin, then post here a link to the page you created.

If you have an account on Pastebin, please do not select private in exposure menu to paste on the page, because no one else that you will be able to see it.

Tags: Mac

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