Often, crossed my computer and not see the word, what is the problem?

Users questions: My computer fan broken, changed after the picture is often crossed, and not see the characters appear the situation, in obvious when playing the game, and now can not even play the game, and very upset, I do not know where the bad, and there When the screen is good, sometimes the screen mess, pointing about who master and do not know where the bad , But I guarantee that no poisoning, some words, obviously because of the display in the upper left corner, but ran to the middle of the screen, and some words are mosaic
Experts answer: should be broken graphics card fan, GPU overheating will cause the output failure, another graphics card fan as long as 20.
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