As ocnor's said, most likely cause is the adapter.... don't suppose any of your friends have a similar machine?
I've taken to buying extra adaptors for some things these days after having issues with them in the past.
Do you have a multimeter? You could check to see if current's getting through the adapter. Also, these things normally either make a small buzzy noise or heat up.... is it getting warm? If not, it's probably dead and sourcing a new one shouldn't be too hard, depending upon when you live...
Good luck...