The power cord to my MacBook is blinking red? It was fine a min ago.

My laptop went blank. I know I was low on battery but not sure how low at that point. I also had my iPhone charger plugged into the USB port. I'm wondering if that has something to do with it? The charger I thought was apple but appears to be one that my son had ordered online. Please if anything here makes sense could you assist. Thank you so very much.
Julesinthesky

Force power it off by holding the power button for approx 10 seconds till it powers off. Disconnect everything. Then trya SMC reset:
Shut down the computer.
Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.
On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.
Release all the keys and the power button at the same time.
Press the power button to turn on the computer. 
Note: The LED on the MagSafe power adapter may change states or temporarily turn off when you reset the SMC.

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