You could try this, but I cannot give you any guarantee that it will work. Hello littlenoodles - It could be due to grub using a screen resolution that is not used by Windows. Graphics work fine in Mint during its boot animation and normal operation. But now that I'm seeing this problem at work, I'm wondering if grub leaves the video system in a state that's incompatible with whatever Windows needs to run its splash animation. On my desktop system at home, I don't get the Windows boot animation at all - but I figured that was because I have my monitor plugged into the 2nd DVI port (the only one my short DVI cable will reach). Anybody know if this a known issue with grub? Anyway, from that point on, it seems okay. I guess Windows normally switches modes from its splash animation when it brings up the real GDI. At first I thought I had corrupted Windows, but if I wait long enough, the screen switches modes and the boot finishes. Grub works, but when I boot into Windows 7 from it, the graphics mode is messed up, and I either get a black screen or a completely garbled (and 'frozen') one when the Windows 7 startup animation is supposed to be displayed. The machine was issued by my company and was imaged with MBR partitioning and legacy boot, so I booted Mint from USB in legacy mode, and it installed grub in the MBR. I just installed Mint 17 KDE on a Dell Lattitude E5440 laptop (Intel core i5 + Intel HD graphics).

Windows 7 boot screen