Did you buy it builded from someone or did you build it by yourself?
Looking in to the configs lets see something that explains that.
Another question
Does the computer do any beep noise?
If yes how many beeps do you hear?
@Edit:
So i think probably is your Power Supply is just to low for all the stuff you have.
Only your Graphic Card and Processor uses already 625 Watts.
I need you to post here all the config of your pc.
Like how many HDD, SSD you have.
Monitors, Fans, every piece of the computer so i can do the calculation and see if the problem really is the Power Supply or if is something else.
So please post everything that your pc has, lights...
Waiting for it so i can help you more.