PC Won't Boot Up

My PC won't boot up. Power is getting to everything and when I turn it on, the fan is going but it's just not starting up or sending anything to the monitor.

Any ideas what could be wrong?

no post beeps at all?

Not a single bleep.

so eveerything is starting as normal and you can hear the harddrive running ?

is the monitor ok ? you tried another monitor or even plug in to tv via vga cable just to test .

Does the indicator light for NUM LOCK go on and off when you press the NUM Lock key?

If you don't have another way of testing the monitor or graphics card but do have another PC; turn the broken one on and use the other to try and find it in Networks. Or look at your router to see if it's connected.