Maeby HDD issue but before formating your PS3 hdd try to read this: When to use Safe Mode
Execute safe mode when the PS3 is experiencing the following symptoms:
When the PS3 is started up, the XMB™ menu is not displayed (only the wave screen background appears)
When the PS3 is started up, nothing appears on the screen
When the PS3 is started up, a message stating [The hard disk's file system is corrupted and will be restored.] is displayed and prompts the user to press X to Restore the system. Original message is displayed again or the system stops during restoration.
When the PS3™ system is started up, an error message stating [The hard disk's database will be rebuilt.] is displayed and prompts the user to press X. The system again fails start up or stops while formatting the hard drive.
The system stops while restarting after a PS3 system update or while updating or rebuilding the database.
After read try in safe mode first number 3 option is still no fix try also number 4 option : Option3:
Restore File System - Attempts to repair all areas on the hard disk drive where files can be saved. Corrupted data may be erased if it cannot be recovered.
Option 4:
Rebuild Database - Deletes messages, playlists, changes made on [Information] screens, trimming information for pictures in [Photo], video thumbnails, video playback history and video resume information.
This operation may take a long time depending on the type and number of data items.Good luck