There is no message in my monitor, my video card seems to light up and i think my hardisk is powered.When you say won't boot up, do you mean fans and lights come on but you get no signal?
Do you mean that literally no power is given at all?
What is your full system spec including PSU make and model?
You'll have to explain a bit more for us to get a better understanding.
Tje psu is de600 deepcoolWhat exact make and model is the PSU?
If I am not mistaken, you should have integrated graphics, power down, remove the GPU and plug into the GPU to see if you get a signal.
I'm assuming it appears to power on, but you get no signal to your monitor at all?