What is a way to shutdown a pi and turn it on with a master switch?

[/RaspberryPi]

I've been making a arcade machine and the stage I'm in is the one with the most problems. One of them is this. On the back of the machine is a master switch which powers on the monitor, led's, and the pi, which is doesn't. When it's on and I turn it off from the master switch then turn it on again with the master switch the pi starts up but there is no signal. I have to unplug and replug the power cable for it to properly start. So my question is how can I make the pi start up with the master switch and have a signal? Hopefully this wasn't to complicated.
Thanks.

submitted by /u/Lurkofeer
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