Are you facing Mac blue screen startup problem on your computer? This is one of the issues where we are unable to access our data or may even lose entire data stored on Mac OS X. Although Mac comes with latest features and have the flexibility to accomplish the task quickly. Sometimes there is Mac blue screen startup error. It is a problem due to damaged or, incompatible startup items or software. You are trying to start your Mac but starting up doesn't progress, and you see the screen is blue with Catherine wheel. Due to this difficulty our data is inaccessible. You can troubleshoot the Mac blue screen startup by repairing, formatting and re-installation the Macintosh Operating system but during this our data can be permanently wiped out. Then how will data be recovered? Either you can use Time machine. It is an application on Mac that offers built-in backup feature of OS X that works with Mac. Suppose, if there is no backup or when Time machine fails than it is better to use Mac data recovery software that can be recover inaccessible data even during Mac blue screen startup problem.