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T420 Video Lags

Update:11-30Source: network consolidation
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My t420 has an integrated Intel HD Graphics card. Periodically, it will pixelate the screen and white out parts of programs like excel. Most recently, it shows an "up-carrot" or < )pointing up, it little sections of the screen. I tried changing resolution, drivers, refresh rate, you name it.
I just took the hard disk out and put it in another T420 to see if it's a physical graphics card problem, or a driver issue. Any ideas?

The Best Answer

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What you are describing is known as "artifacts" and that usually happens when a person overclocks a GPU.  Unless you did that, then the only other thing I'm thinking is either overheating or faulty GPU
First test and see what the temperatures are so run GPU-Z and see what it says:
http://www.techpowerup.com/downloads/2101f/GPU-Z.0.5.9.exe
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