Files appear corrupt in Preview

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Out of nowhere today, anytime I open something up in preview... the files appear corrupt? I'm not sure how else to explain it, but it basically looks like blocks and rectangles of color. I've restarted my computer, as that's all I know of what to do, ha! Please help!

desktop.png
 
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What model Mac is it ? What OS are yo u running ?

To me that looks like a failing graphics card. Not knowing what OS you have, we can't really give you anything to try, as El Capitan is a lot different from the OS before, Mavericks.
 
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Oops! Skipped Yosemite! ;)
 
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MacInWin

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What puzzles me is that the background of the pictures is ok, so if it's a graphics card, it's not generic, if you know what I mean. Puzzling.
 

chscag

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What puzzles me is that the background of the pictures is ok, so if it's a graphics card, it's not generic, if you know what I mean. Puzzling.

I agree. And it would be nice if the OP told us which Mac he has and what version of OS X it's running.
 

Slydude

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What kinds of files are these (.jpg, .png, etc)? What happens if you try to open the files in another program?
 
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