Why do I get a computer had to restart when I open my Mac.?

I get a page showing (your computer had to restart) when I open my Mac Pro. Why?

That is a kernel panic. It happens when your Mac discovers that things are so wrong inside the Kernel, that continuing is impossible.
A report of the Internal State of the machine is saved in a  log, and can be read back later for analysis. Use this article to find the report. If it makes no sense to you, you can copy and paste it into a reply frame on the forum for readers to analyze.
Mac OS X: How to log a kernel panic - Apple Support
If finding and looking at the report is beyond your abilities, make a genius Bar appointment and they can do this for you as well. The analysis is free, but the stores are crazy-busy with the new software releases (Yosemite and IOS 8.0.2) so it will be a while before you can get an appointment.

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