My Mac randomly just turned off and now it wont turn back on, the charger light is faintly flashing green and amber?!?!

My mac randomly turned off last night had some trouble with an uncertified usb cable that I was trying to charge my iphone 5S with but it came up with that message of not being able to charge with this accessory or something so i plugged it into my mac thinking it was my plug to charge my phone then like 5 mins later my mac just randomly turns off and it did have like 90% batt but i still plugged it back in thinking it was just being wierd but then i pressed the power button after it being plugged into my mac and it wouldnt even turn on no fan starts or anything and now the colour of the charger light is very faint and is almost flickering between green and amber, please help me out I dont want to pay loads of money for something that I might be able to fix?!?!?!

I actually just fixed it. Here is what to do;
1. Unplug everything from your computer.
2. Take off the bottom of your MacBook / Pro / Air. (There are usually 3 screws that are longer than the rest near the vent, remember where they go.)
3. Carefully unplug the battery from the logic board.
4. Wait 10 seconds.
5. Plug the battery back into the logic board.
6. Put the bottom cover back on.
7. Reboot the computer holding the "Option" key.
It's not exactly what I did but it should work. If it doesn't work, what I really did was unplug the battery and then plugged my charger into the computer, the fans started spinning and then it shut off again. Then I plugged the battery back in, put the bottom on (with no screws), and tried booting up again. The Apple chime played and then the computer shut off. So I tried booting again holding the "Option" key and it booted up like normal. I then restarted my computer to make sure it is back to normal and it is.
Wow what a relief. I was really scared there for a minute.
*And for everyones information I was using a Belkin USB cable but it had never done that before.

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