Parts of screen suddently blackens

Solution
Could be from a bad driver. After Windows 8.1 update, I think your laptop uses a different driver.
I have a Samsung ATIV XE500T, and at one point after updating to Windows 8.1, it couldn't display anything to its HDMI port. After weeks, there was a new driver released which fixed that problem. I hate these things that have bad drivers since the day of release. Some problems gets fixed after a year, some never gets fixed.

hp79

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Feb 6, 2006
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Could be from a bad driver. After Windows 8.1 update, I think your laptop uses a different driver.
I have a Samsung ATIV XE500T, and at one point after updating to Windows 8.1, it couldn't display anything to its HDMI port. After weeks, there was a new driver released which fixed that problem. I hate these things that have bad drivers since the day of release. Some problems gets fixed after a year, some never gets fixed.
 
Solution