My PC does not start

I have windows 7, I made the latest updates of W7 run ccleaner, turn off the computer and from there it does not lift my pc, it tries to open and turns off, I have tried with the PFs and it continues to turn off. Please help. My mail:**********

what is PF´s?

have you tried the safe mode?

does your pc starts? (hdd-leds light up, the fans will start, any usual start noises etc...) or is nothing?