Hi Folks! I just have a Problem to get Yosemite run on my Macbook Pro 13 ". I've installed it over Mavericks, after the Installtion i restartet and got a prohibition sign. Okay second try. I installed Yosemite with a USB stick "clean" and it worked! Just restoring my programs and data over the Time-Machine-Backup. After finishing that, restart. BOOM same problem as before. Does anybody know if there is a program that will let Yosemite crash or any other suggestions what the problem could be? And sorry for english guys Thanks for your help!