first thing to do, since you are not hearing any kind of beeping at all, is to make sure you have your pc speaker plugged in correctly. that way when you boot the computer, if it doesn't post, it will give you a beep code that you can then look up in your motherboard manual, it should tell you what the problem is.
also, i'm surprised noone has mentioned this, but when asking for help on your system, it is helpful if you post your complete systems specs. what kind of hardware are we talking about here??