My macbook won't recognize that it is plugged in- will not charge

I have had my macbook for about a year or so, and this problem started last night. I had had it running on battery power until it was near empty, and I tried plugging it in and nothing happened- the light on the cord did not light, the charging icon did not appear on the screen, and the power continued to drain. I tried plugging the power cord into a different outlet, with no success. I went to a different floor in my house and plugged it in there, still nothing. The battery ran down to 0 and still it will not charge- do I need a new power cord?

My Macbook did the same thing. The adapter quit charging one morning. I bought a new magsafe from Apple, and after some "discussion" A new battery was also sent=Gratis.
Unfortunately, even after hours on the phone with tech support my laptop will not charge despite a new battery and a new adapter. I have of course followed to the letter all of the recommended software updates including power/management/memory/reset programming with the assistance of tech support. I reinstalled the operating system numerous times as well. My laptop won't charge since the day six months ago it suddenly failed. It was perfect until that moment. There MUST be an explanation, yes, the adapter sending grounded power perhaps, causing a .25 cent diode to fail. Sad that the circuit board was not gated for better protection from a short circuit.
Please let us know how's it going?

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