Mac Book Pro Charger won't charge

Just yesterday my Mac Book Pro "L" 85W Magsafe Charger would not charge my laptop. Eventually I tried using my sisters Charger, a 60W "T" Magsafe charger. It seemed to charge for a day, but today that charger has died as well. I can't understand why these chargers are dieing suddenly, whats happening and what can I do?

The Apple power adapter includes circuitry that cause the adapter to shut down for various reasons: over-temp, over-voltage, over-current.  The adapter can be reset by unplugging it from the computer, unplugging it from the wall, waiting 30 seconds, plugging the AC input adapter cord into the wall and, finally, plugging the DC output adapter cord into your computer.

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  • HT3964 BRAND NEW MAGSAFE POWER ADAPTER WON'T CHARGE THE MAC BOOK PRO

    I'VE RESET MY MAC BOOK PRO BECAUSE THE POWER ADAPTER STOPPED LIGHTING UP & WORKING AND ITY'S STILL NOT CHARGING THIS IS A BRAND NEW MACBOOKPRO I JUST PURCHASED IN BEST BUY & I DON'T KNOW WHAT TO DO IT'S NOT CHARGING THE BOOK! DOES ANYONE KNOW WHAT I SHOULD DO?

    Do a SMC Reset,
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    https://discussions.apple.com/docs/DOC-3046
    A new machine shouldn't need one, but it's it's not charging that's the solution.
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