Emac shut off, and wont turn back on...what do i do?

I was sitting on the computer just working on some stuff and it just...shut off completely. It wont turn back on. Please help!

Zadee...
First elimate any power related issues like
connections, switches, cords, outlets and so on.
Don't forget circuit breakers.
Other than that, you may wish to reset the PMU by
pressing it once, and let it sit few hours before
pluging it back in. (Unplug first, of course)
You'd have to pull the battery, too. And usually if the PMU hasn't cleared after 5 minutes max with no power and no battery, it ain't gonna.
The PMU button is located inside once you remove the
memory door.
Beyond this, contacting a Apple Repair Service would
be the next step.
If it's not external power (power cable, wall socket, that kind of thing) and it's not the PMU, it's almost certainly either the power supply (which end-users aren't supposed to mess with and even techs usually simply toss and replace if it breaks) or the motherboard. (Ditto.) Pray that it's the power supply, that's a relatively cheap fix. Motherboards are expensive.

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