You were working fine on your Mac system last time but now when you open it the Mac stuck at Apple logo. These is only the white screen with the logo between it and there is no response of any input that you are feeding to it. This is because the Mac OS X is not loading in the system, it can happen if there is a problem in the startup disk where the operating system is installed. It may have gone corrupted which you can fix by using the disk utility. If the tool fails to do so Mac stuck at Apple logo will still be shown and you will have to format the drive to remove the corruption. This will also delete all the files that are in that particular drive. You do not have to worry about the erased data if you have configured the time machine backup earlier but in case the time machine does not work or wasn't activated then you can use the Mac data recovery software which can restore the data with ease. You have to scan the drive and the preview of the recoverable files will appear. Just select and recover them and Mac stuck at Apple logo will not bother you anymore. So get the software now.