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/Whi...e%20Manual.pdf
https://dl.dropbox.com/u/8010163/Com...ata_Manual.pdf