Macintosh startup issues can take numerous structures, however stalling at the gray black screen could be a standout one among the most troublesome problems. Usually, there are various of reasons for the emergence of Mac OS X: gray screen appears during startup issue. The most common among them is the presence of bad sector into the Mac system hard drives. Apart from that, users also face Mac OS X: gray screen appears during startup, if they have unintentionally formatted their hard drive and the installed OS X gets corrupted. Further, due to all these reasons your Mac system fails to boot and gets halted with gray screen. Now, what you do to fix Mac OS X: gray screen appears during startup? Well, the most common way in such situation is to re-install the Mac operating system. But, doing so will erase all the stored files. So, to restore all those lost Mac files users have to go for third party Mac data recovery software. Its highly reliable algorithm can effectively retrieve all lost or deleted Mac files without disturbing the integrity of data.