Apple yesterday published a new support document detailing fixes for an issue where the right side of a user’s Mac screen may be distorted when running Windows 10.
Some Mac models with AMD Radeon graphics may be experiencing an issue where the right side of the screen flickers and is distorted when running Windows 10. On external displays, this distortion may affect the entire screen.
Alternately, the Windows 10 installer may say that the Mac isn’t ready for this version of Windows 10 because it has an old AMD graphics driver.
Read more at MacRumors.com