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TIP: USB devices can prevent Windows installing on Macs

Windows may boot a Mac to a black screen during or after installation if you had a USB device connected to the Mac during a Boot Camp installation procedure. According to a newly updated Apple tech document, this can occur if you installed Windows from a USB optical drive or USB flash drive, and had another USB device connected to the Mac. This does not include a USB keyboard and mouse.

The workaround is to reinstall Windows without the extra USB devices attached: leave only the USB device containing the Windows installer, and a keyboard and mouse if needed. First, restart the Mac by holding the Power button. Hold the Option key down and select the Windows installation media when its icon appears on the screen.

If you've tried this .