What Does Flashing Green Power Cord Light Mean?

Today, my MacBook Pro Retina charging cord started showing a flashing green light on the mag-safe connector.  What does this mean and how can I fix it?

This sounds like some sort of power issue.
Are you using the 3 prong plug or the 2 prong (dusk head)? If you are using the dusk head try the 3 prong.
You can try a SMC reset:
Intel-based Macs: Resetting the System Management Controller (SMC)
Also read thru this and check all that it suggests:
Apple Portables: Troubleshooting MagSafe adapters
Check/clean pins/sockets
If still no joy there may a damaged conductor in the cable/attachment to the brick issue.
You can take it to an Apple Genius bar for a free diagnosis/evaluation, bring both the computer and the power supply.
Make an appointment first, as they can be quite busy:
http://www.apple.com/retail/geniusbar/
All the Best

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