Did you setup the partitions using Mac OS, and did you format the second partition as FAT (or HFS, or whatever else) rather than blank space? If so: Disk Utility, for Bootcamp compatibility reasons, will create a GPT-MBR hybrid if you tell it to make more than one partition on the drive (not counting EFI partitions and blank space). Once this has happened, despite the presence of the GPT, Windows will detect it as an MBR disk and will refuse to install on it. There are two possible options:
Did you setup the partitions using Mac OS, and did you format the second partition as FAT (or HFS, or whatever else) rather than blank space? If so: Disk Utility, for Bootcamp compatibility reasons, will create a GPT-MBR hybrid if you tell it to make more than one partition on the drive (not counting EFI partitions and blank space). Once this has happened, despite the presence of the GPT, Windows will detect it as an MBR disk and will refuse to install on it. There are two possible options:
1. Blank the HDD, don't install Mac OS or anything else to it, and set up from scratch using Windows. In this case, Windows will automatically build the GPT and EFI system partitions for you.
2. In Mac OS, format the HDD as two partitions, and select Blank Space for the type of the second. Windows should then allow you to create a new partition and install in that blank space.
Hope that helped.
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</unattend>Or if it's a different monitor or an external one connected.