I had an issue very similar to Alison and Fran's last year maybe...
I came home and got food from the freezer, it was not working... I unplugged, plugged back to try and reset it.... Nope didn't work, called the people we bought from and they said to try and leave it for 15 minutes unplugged.
During this time David and I noticed how hot the sides and top of the freezer were. It is a 17 cubic foot stand up freezer, that was currently packed to the gills with food and was thawing quickly!
I had no idea how long it had been out, I had been in it Sunday, but did not remember if it was working then, but the food was solid, now not so much.
well, by this time the 15 minutes was up and no it did not work... The light came on but no cooling was happening there.
I called around to a couple of places and found some dry ice, bought 15 pounds and shoved it in the freezer. This morning everything was frozen.
The company we bought it from called us at 6:30 this morning, they were bringing out a loaner freezer that they had on hand, and they would install and move over all the food, but they had to do it right then.
So 7AM they show up, (I am already on my train) and they move all the food, but it is bigger than the one we had, a newer model and now it was 21 cubic feet, no big deal just move some stuff out of the way.
After they get everything moved, they give a piece of paper to David to sign showing receipt of the freezer and that they are giving us the freezer.... as a replacement, not even trying to fix ours, just give us this one. and it had less than 1 hour of use...
I was happy! a brand new freezer and no food spoilage, and they did all the work.
How cool is that.