Is lion prohibitory sign annoying you ? There would be some start up warnings which you might have to face sometimes. Prohibitory sign is such common error which appears as gray apple logo that is the sign of issue in system while boot. Generally lion prohibitory sign denotes the situation wherein system is capable in recognizing the OS however unable to boot due to problems occurred in system. So, it is essential to resolve this problem immediately. You can fix this error through using some measures including repairing the disk, reset the PRAM and if there is access of another Mac available then replace the mach_kernel file. lion prohibitory sign can be resolved this way but after performing the task there would be possibility of data loss. Having updated time Machine backup will help for restoring the lost file otherwise it is advised to opt Mac data recovery software which is one of the popular tool for recovering the missing data. It allows you complete and reliable retrieval of file without hassle. This application does not require any type of technical skill in order to restore the lost file. Therefore this application is pioneer solution in restoring lost data due to lion prohibitory sign error.