the first question for you is:
Does the compressor turn on?
start the engine, turn temp to cold, then turn the thing to AC.
yu should immediately feel a bit of a luch and feel the engine note change.
if it turns on, have the refrigerant level checked
if it doesn't, chek the compressor clutch fuse, recheck the connection on the plug, and try to find out why its not coming on from there.
I wouldn't think itm would be a belt misroute issue, you'd notice an empty pulley really quick:D