Pick from:
1). Your ps3 begins moving away from you. Your xmb menu doesn't go back up with the xmb menu.
2). Move everything out of safe mode by pressing the directional shift key on your controller. Find the xmb menu option and select the right button for safe mode.
3). You see an error that says, " the hard disk's file system is corrupted and will be restored " but the restoration process is not successful, or you see that same error repeatedly. Your console stops working during an update, or after the restart that follows an update.
4). About four minutes have passed since you did your settings on the device; you can now try to enter safe mode by pressing the same button. You can only play safe mode as long as the xmb menu comes up.Choose from options above and answer: What most naturally follows?

How to enter safe mode on a playstation 3
Know when to use safe mode.
This is a good choice if :
Your ps3 starts up but the xmb menu doesn't come up (you only see the wave screen, instead). Your ps3 starts up but nothing happens on the screen.
Answer:
3).