Your Mac system is not booting up and you are getting blue screen then you need Mac blue screen fix. This problem generally occurs when there is any type of issue with the Mac OS X or with the start up disk. May be the operating system is having severe internal error in this case you have to reinstall the software for mac blue screen fix. If the problem is with the start up disk then you can fix it using the disk utility which you can access in the single user mode via terminal. You can also use fsck command to check for Mac hard drive error. If the problem is not detected or fixed the format the hard drive for achieving mac blue screen fix. You will certainly lose all your data but that can be restored using the backup you have or else try Mac data recovery software to restore all the lost data of your Mac hard drive. Use the software just after you perform Mac blue screen fix as there is a danger that the deleted data will not be retrieved if overwritten. The software is very easy to use that is why any novice user can handle it for complete recovery.