What Does Flashing Green Power Cord Light Mean?

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

Ahh.

Glad your up and running properly, I assumed you were using it at a place that you always do. I've had strnge things happen in public places such as airports as well.😉