Freezer quit...?

Received a older chest freezer recently, brought it home, cleaned and plugged it in. Set cupp of water in and within several hours it was frozen solid! two days later we make the ever dreaded Costco trip and fill it about 1/2 way. today i go out and find that it is not freezing inside any longer. I turned the thermostat and I hear it click but then nothing?? no motor humming like before, nothing? It is an older freezer but it seems to be in good condition. any advice as to where I should start??
:confused:

It is a Montgomery Ward.
Mod # HMG 8558080 A,
Ser. # 77L 19899260
This is all the info I have on it. It clicks for a scond like it is trying to start then nothing. The tank under (black) is warm to the touch but not hot as well as the little (elec. ?) module next to it. I am not an appliance person so please excuse the descriptioni have given, thanks