Following is the thing i found after many searched for you..
Anything goes awry in this unholy menage-a-trois that causes a hard shutdown, harms the OS and it is being a great reason subsequent failure to boot up due to a lockup at the "Welcome" splash screen, You will have to press the "enter" key with machine gun rapidity when the "Welcome" first starts moving and keep it up despite the little tone telling you to desist. It seems to work. I have run out of more logical solutions....
This is the only thing i can suggest for animated techniques whether in form of animated movies or anything else.