check around drum for a metal clip that is used to hold the top of the dryer down if this is an older machine....I just bought one and there was a huge screeeech when I first started it up and drum actually stopped...look for scratch marks perhaps on drum....(and if it is more like a bumping booming noise.....check for a squirral in the cavity!!! yep...it did happen to me!)
KCinFW | 
Dryer screaching but working 
