Power Cable for 700M Inspiron

My power cable just decided to stop working today. It is only a few months old since I purchased it this summer. I go back to school on the 15th, Sunday and this is the only computer I have - and I need it for school so I need to get this fixed ASAP.

I tried unplugging it from the outlet, putting it in a different outlet, unplugging it from my laptop, replugging it into my laptop, and unplugging the two parts of the power cable and replugging them back together. Nothing I did helped. It's not that the computer won't recognize it, it is that the cable isn't working because the green light that is usually on when it is plugged in is not on and nothing I do will make it turn on.

I really do need to solve this quickly.

-- Ruth Spalding