Small squares on all screen

My iMac 21.5 "mid-2011 (2.7 GHz i5) began to exhibit strange behavior where the little squares of color, about 1/8", appear on the screen. They then proceed to dance around the screen that I continue to work on the computer. I have attached a screenshot. It seems the forums looking for others have this problem, but I'm unable to find discussions that actually contain a fix. Any help would be much appreciated!

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  • Points square on the screen

    iMac (21.5 inch, mid 2011)

    Intel Core i5 at 2.7 GHz

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    Hello! Im having a problem for a few months. Small squares appear randomly on my desktop. It allows to be little and I realized that this was the case when I click once on a document to preview. I'm not very sure, but far as I could recognize it happen when I click once on a doc saved in Dropbox or my external drive (not a text file or a one .ai) photo. These points were fast blink until I get the cursor out as pictured 'Old', then it stops. (Note this: I couldn't get a screenshot of this, I had to take a picture with my camera!) If they stay when I drag any window above him, it recharges. But now there are more. And I can't get rid of them. Add a picture of what is happening now, it's the peak "Today."

    Yesterday, I read something about kernel extensions (I don't have a single clue what are they, Im a graphic designer with almost no knowledge on the functioning of the Apple products!) and I disconnected Dropbox. I restart the computer and it works for the whole days perfectly. Yesterday we had a power cut at the studio and I restart the computer today and it was full of boxes as the pic "Today." And I can do a screen shot of it.

    Now I restart the computer by pressing Cmd-Opt-P-R, and all seems fine again.

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    "Now I restart the computer by pressing Cmd-Opt-P-R and all seems well again."

    That reset NVRAM/PRAM.  http://support.Apple.com/kb/PH18761

    Some display settings are stored in the NVRAM EXTRA memory

    Is the problem solved after resetting the NVRAM/PRAM?

    If she did not help, click on the "Contact support" link in the upper right corner of this page.

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    ------------------------------- UPDATE --------------------

    The problem, small square boxes showing on the lines Freetext tool reviews, is not limited to blank lines, as I originally reported here. These boxes are appearing at the end of each line. It does not matter whether or not the line break is hard or soft, if the line is empty.

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    theboxes.JPG
    --------------------------------------------------------------------

    -Original message-

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    I have small square boxes appear on empty lines. (read my update above -boxes are at the end of all lines, conditional jump or jump) )

    I'm a programmer (37 years and more and more aspects of the processing of data) and I decided to learn PHP programming "language" to add some treatment of some of my web sites on the server side. So, I found a pretty good php to PDF manual and would use.

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    How can I get rid of them?

    They are not present when I open with Acrobat PDF, only when I use an Acrobat Reader.

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    P.S. Do you know that you can have a heart attack without pain in the chest, shortness of breath, or left arm pain? Well, you can! I had two and one almost killed me because I had no idea it was a heart attack. You can read about it here first one. Convey this, it could save a life.

    My second heart attack took place October 4, 20112 - he started, about 03:15, as did one, with a headache. It turns out the implanted stent in 2002 had been completely clogged by too many cultured tissue. The doctor put another stent inside one.

    Problem solved - it is a police problem. Apparently Acrobat cannot manage specific fonts and it is best to stick to a very small selection of font - Arial, Helvetica, Times Roman.

    I have not test a large number of fonts. If I do, I'll post there results here.

    Bob

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