I installed a transmission on my 2004 Chevrolet silverado and it won't run?

Did you start the engine? Did you put the drive-shaft in? Hook up the electrical connectors correctly?Coolant lines? Shift lever? You don't have enough information in your question to get an answer. Based on what you have the only answer would be "You have either put in a transmission that was no good, or, You don't have it installed correctly".
 
have you tried putting transmission fluid in the tranny and torque converter
 
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