When a Mac is showing absolutely no signs of life, it is more than likely a Logic Board issue.
Yeah, if the Mac shows no signs of life, there is no way to tell if the SMC has been reset.
Before all hope is lost, try disconnecting all of the components from the Logic Board except for the keyboard. Then, hold the power button for over thirty seconds to completely reset the Logic Board. Plug all the components in, and then plug in the MagSafe adapter. See if the light comes on.
Also, check the DC-in port (the little port that connects MagSafe to the Logic Board). There's a slim chance that the Mac is simply not getting any power. Also, on the side of the Mac, there is a little button that shows the battery power. Press that to see if anything happens.
If all fails, your Logic Board is broken.
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