Hi,
Few questions, does that happen also when you connect an external monitor as well? Does it happen in specific programs only?
Please do try these troubleshooting steps.
- Go to Device Manager and uninstall the graphics driver.
- Open Programs and Features and uninstall anything related to your graphics card.
- Download and install the latest driver from the manufacturer site.
NVIDIA:
http://www.nvidia.com/download/index.aspx
AMD:
http://support.amd.com/en-us/download
Intel: https://downloadcenter.intel.com/
- Once installed reboot your PC for all the changes to take effect.