I recently purchased a new Mac Pro (running Sierra 10.12.2). I've installed Parallels 12 successfully, but am running into a problem as I try to create a virtual machine running Windows 7. Each time I try to install, I get through the configuration process and then receive a "No boot device is available, press Enter to continue" message. I found a thread on here that talks about this error when using a previously-working virtual machine, but it does not seem to apply to the error occurring during installation. If it helps to know, I am trying to install from a disc image (created from Windows install DVD). Any help or suggestions would be greatly appreciated!