Hi newcomer and welcome to the Tom's hardware forum.
Do you hear your OS load?. The 1st step will be unplug all the PSU cables and connect it again.
I have already done that. I have checked some components already. I check the Ram, the video cards, the HD and I still have the same problem. Everything turns on when I press the on button, but nothing comes on. I can hear the HD moving but that's pretty much it. I started to think that it might just be the motherboard, because I turn it on without the ram and no beep errors. Also the its not picking up the mouse or the keyboard.