2004 Infiniti G35 • 129 miles

Hello, I have a 2004 infiniti g35 and im getting a squeel everytime I turn the a/c on. If I do not turn on the a/c I have no squeel at all. I replaced the idler pulleys and assembly as well as added some underdrive pulleys, ie crankshaft, water & alternator pulleys. I just put on brand new belts of the appropriate size and tightened them. Still get the squeel. Is it possible my a/c compressor is bad? I rotated the pulley on it with the belts off and heard no noise at all. Maybe I over tightened my crankshaft pulley? I have no clue, please help!
December 29, 2012.

It is possible the compressor did not get enough oil pressure from low spinning speed. It has oil in the refrigerant that needs to be circulated and it may have not had enough pressure to lube compressor enough.