When I plug in my ge freezer, it makes a loud buzzing noise and doesn't come on...

You have a tight compressor or a bad start kit. You can get a new one at an HVAC or appliance parts house. You will need a meter to find start, run, and common terminals on the compressor and to check it out. Here is a manual on using a meter and testing a compressor: https://dl.dropbox.com/u/8010163/Whirlpool%204322537A%20How%20to%20use%20Test%20Equ ipment%20Service%20Manual.pdf
https://dl.dropbox.com/u/8010163/Compressor_Data_Manual.pdf