Home Forums Peripherals & Multimedia Audio, Video, Photography turntable playing with no sound

OS 10.6.8 imac 2009 I have a stanton T90 usb turntable which I havn't used for over a year and today I thought I would convert some LPs to digital. I played a record but there is no sound and no matter what I changed in the sound prefs, I could not find a solution. The usb cable is hooked up to the turntable and the usb in the computer. The other cable is plugged into AC in and the other end into the power bar. Also I have external speakers. itunes is playing ok. Can someone help me out. Thanks. jaybass