A new cartridge as others pointed out would be a good start. However, sometimes a used record is going to give you some noise and sometimes you'll find a used record that is simply "black" in the background. On those days you rejoice, but you'll find some days to cringe. While I've come to accept the occasional snap and crackle as part of the charm of buying used records, I go nuts on noisy records. Sometimes you buy what looks like a "clean" record but discover loud grove damage from the previous owner's bad needles rendering the lp unlistenable. Regardless, enjoy the journey back to vinyl as there's more good than bad in the medium if you understand the pitfalls that come with this format.