Computer experts - what causes that color disk?

It's the ball of death on the mac. Likely a plugin to the browser that was acting up - the Google Earth plugin in this case. If you were using Safari, try changing browsers - Firefox comes to mind.

that's amazingly a difficulty... i can in straightforward terms advise to to get into risk-free mode and verify the even viewer. it might a minimum of practice u some information of the previous crashes... further plan of action relies upon on what u locate in there...