I have a Quadro 2000 vga card installed in DH77DF, "video optimize" (UEFI mode)and "Secure boot" always fail.
But when I only use integrated VGA, both functions are OK.
Today I test another video card " GTX 650", the same issues like it happened to Quadro 2000.
So I think this is a common issues on Nvidia video card.
Please check it, thanks.
Victor, thank for your response.
And I also want to push your engineers to modify intel forums to run smoothly in IE10 Windows 8.
Because now I can only reply in "IE 9 standards" mode, maybe many people also feel inconvient as I do.