Non-functional PS4 Power Supply. If your PS4 is not turning on and only shows a blinking blue light, ... Sometimes, a random software bug can lead to light indicator problems on the PS4.

I/O on the new PS4 consists of gigabit Ethernet, HDMI 1.4, Aux for the PlayStation camera (which you'll need in order to use PlayStation VR), and a standard figure-eight lead for power.Those ...

Disconnect the PS4's power cord from the back of the console. Don't just unplug the cord from the wall — it needs to be disconnected from the PS4 itself to clear the cache.