Dell Precision m4600 screen flickering pixels

My laptop is Dell Precision M4600 with graphics card nvidia Quadro 1000m.and CPU Core i7
I was watching a movie on the laptop and suddenly i noticed something wrong my screen got pixel termites fuzzy flickering pattern changing dead looking pixels every where.i restarted the laptop several times with no change then i noticed that when i start the laptop from cold state the problem appears and after 5 or 10 min i close the lid and open it again the problem disappears.i tried it 3 times till now.can anyone explaining what`s the problem?
thanks in advance.

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That's usually a GPU failing.

I looked this model on the web so it's years old.

Try bumping your canned air schedule to daily for a week, weekly for a month and then back to 1st of the month.

If that doesn't cure it, replace ALL heatsink compound under all heatsinks (under 10 bucks!)

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Part can`t understand

I bought it a month a go as a refurbished.the part i can`t understand why it disappears when i just close the lid and open it again and don`t when i restart it?!!

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I have a theory why

But it's just a theory. As it's new to you, use your warranty before you are stuck with a defective model.

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I tested something

I`d like to thank you for your care.when this problem came up again i attached an external Monitor to my laptop through VGA Cable to test if this problem from the laptop monitor or GPU failing.i found that the external monitor works perfectly without any problem while the problem still at the laptop screen.and run video card stress test from DELL diagnoses tests and it passed it for the two graphics cards.

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That confirmed the laptop is the problem.

It's new to you so exercise the warranty while you still can.

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