Is your Mac os x lion stuck on loading screen? Is this problem makes you worried about the safety of stored data in the computer? If yes then you have reached at the correct place. Like you some other users are also going through this situation. Let me tell you that the Mac os x is a best operating system that is very popular all over the world. User can store their all data in this system in a very safe way with an organized manner. Apart from its advantages there is also a disadvantage. Sometimes you will notice that the Mac os x lion stuck on loading screen. The reason behind this problem is to incorrect installation of Mac os x or interruption in upgrading this Mac os x. If your Mac computer is infected with the harmful virus then you many also observe that Mac os x lion stuck on loading screen. System file corruption and software/hardware issue is also the factor of this problem. It is informed you that this issue will make a chance of data deletion. So if your important data gets lost and you don't have backup file then use Mac data recovery software to get back all the lost data.