Castanosaur :
Sorry it's an old computer from my moms friend, I don't have any manuals. How do I short the cables? Sorry for everything I'm just very frustrated. A few more details- before it started not turning on, I shut it down normally earlier this afternoon. When I tried to turn it on again its all just normal, fans, lights were on but there was nothing on the monitor. So I just tried to turn it off and on using the power switch and now I think it's broken.
What brand/model is the computer?
In this case, you're really just completing the circuit, not shorting it, but without getting into too much semantics, all you need to do is to place some metal object across two wires or pins.
You mention you
think the button's broken - what happens when you press it? Are any lights on inside the case if the computer's off?