Spoiler ===========STOP!============= BACKUP YOUR PS4 DATA BEFORE DOING THIS PROCEDURE - FAILURE TO DO SO WILL RESULT IN LOST DATA. See how here: You have been warned! If you still have issues after this, you have a HARDWARE issue. A follow-up video will be following shortly to superseded this one so stay tuned! Updated 31/05/2017. ============================= This video quickly explains the issues relating to the repair of the PS4 application launching error CE-34878-0. It gives details on how to fix the issue quickly to get you back gaming ASAP providing this is a software issue. If it doesn't work for you, then likely you have a hardware fault requiring attention from Sony, or an independent repair specialist.