PS4 has a changing LED light on the roof of the console to indicate the current condition of the system. There are four different LED colors that you should be aware of so you can easily tell what state the console is in.
Here are the four different colors and their indications:
When you power on your PS4, the blue LED light will flash. This means that your console is delivering a signal to your TV, preparing to start up. However, if that blue LED light stays on for more than 30 seconds, there may be something wrong with the console in which case you should immediately call Sony’s Customer Support.
The white LED light indicates that your PS4 is running in a normal state.
Your PS4 can be placed in stand-by mode, which will cause the system to display an orange color.
If you see a blinking red light it means that your PS4 has reached the maximum optimal temperature. In order to prevent further damage to the system, the console will turn itself off automatically. Ideally you should wait a few hours before turning it on again but you may find that if you place the console in a better position where it is further away from any heat sources, it may function as normal.
To recap, there are four colors: Blue, White, Orange, and Red. You have nothing to fear, unless your system’s LED is red.
There have also been reports of a blinking blue LED light. This suggests that there is an issue with the audio and video outputs to the TV. Eventually, the console will power off. It could be an issue with the PS4 hardware, power supply, or even the hard drive. If you encounter this problem, there is a trouble shooting guide to fixing the blue blinking light of death.