Try booting into the virtual machine BIOS. See if somehow the Network Boot got changed to the first boot device. If so move it down or move the hard disk up as the first boot device. Press F10 to save and reboot. If the boot order has not been changed boot to the BIOS again and move the CD-ROM as the first boot device, insert the CD or image file for Windows Server 2012 and perhaps you can repair the disk.
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