Sounds strage , I would first reset ps4 and hold down the power button and get into safe mode:)
Starting the PS4 in Safe Mode
Turn off the PlayStation 4 by pressing the power button on the front panel. The power indicator will blink for a few moments before turning off.
Once the PlayStation 4 is off, press and hold the power button. Release it after you've heard two beeps: one when you first press, and another seven seconds later.
Connect the DualShock 4 controller with the USB cable and press the PS button on the controller.
The following options are available in Safe Mode:
Restart System: Ends Safe Mode and restarts the PlayStation 4 normally.
Change Resolution: Changes the screen resolution to 480p when the PlayStation 4 is restarted.
Update System Software: Allows the PlayStation 4 to update the system software via Internet, USB Drive, or Disc.
Restore Default Settings: Restores the PlayStation 4 to the default factory settings.
Rebuild Database: Scans the drive and creates a new database of all content. This operation may take a long time depending on the type and number of data items.
Initialize PS4
my guess that the hdd has crashed , or you didn't shutdown the ps4 to its liking the last time u used it a week ago , and have currupet the hdd but all hope is not lost :)
i would try rebuild datBase first , then update system software , then if that won't fix it I would initialize ps4 :)
depending on the out comes of the above , eg error messages etc , I would consider a new hdd :)
if if under warranty give it back to Sony to fix for free :)
The worst case , it's the hdd has iisues