That's just it, it isn't in a terribly convenient place. An Antec 900 case that sits on top of my desk. that reset button is pretty hard to access in a panic situation. I guess I could just relocate the wiring for that switch to the upper plastic part, where the big top fan is.
My main idea is to have it wired in the PSU wiring. Effectively making my toggle switch like the on/off switch on the back of the PSU. it has to be on for any power to be able to be sent. I just can't quickly hit that switch on the PSU or the case's reset switch.
I have the breakdown of what wire is what in the 24-pin molex plug, but not quite sure if there is a single wire in there that makes the magic happen where I can just wire my switch in-line with that.
Don't know where you are going with all this but can tell you how to make it happen. Here is a 24 pin motherboard connector:
Note the Green wire, there is only one green wire on either a 20 pin or 24 pin motherboard main PSU connector. That is the line you want, called the PS_ON line. When the system starts that line is held at a logic High (using 5 Volt SB power) by an internal pullup resistor in the PSU. When you press the front panel Start button that line is pulled low (common) and the PSU starts. As long as that line is low the system (PSU) will run. That assumes all voltages are within their rated tolerance. Removing that logic low will instantly (as in right now) shut down the PSU.
Therefore placing a NC (Normally Closed) push button in the path of the green wire will cause immediate shutdown when the button is pressed. Breaking the logic low will allow that line to instantly go high as a result of the PSU pullup resistor and you get a very hard shutdown.
Keep in mind when this happens it is like yanking the plug on a running computer. You stand a real good chance of data corruption and screwing your OS.
NOTE: I strongly agree with CharBroiled on this in that doing this instantly is not the way to go. Placing an external NO (Normally Open) button in parallel with your Reset pins on the motherboard would be much wiser. How I told you this could be done will work, that does not mean it is a real bright move.