squealing noise
i know this may be going to sound simple to fix for most but i am extremely technicaly impared in the mechanics departments 
my fiance has a 2005 pontiac sunbird and for the past few days , every time i turn , there is a squealing noise hapening . when speaking with a few people , they mentioned to check the power steering fluid , which i already did and no fluid was missing there . the noise stops once in awhile but is still there most of the time .
anyone knows what i should check next ( or what it could be to check with a mechanic ) ?