I’ve checked all the known issues here. Windows 7 64 bit is fully up-to-date and all drivers are current. The Windows 7 Aero theme is enabled with all the functionality described in the thread on that subject. I’ve re-installed Cubase 8 and re-booted several times.
When I attempt to boot Cubase Pro 8, I get the spinning circle for a few seconds and then nothing. Checking Task Manager shows no Cubase application or process running. I’m open to ideas… 7.5 runs fine and 8 is running fine on my laptop.