It sounds like the new cartridge is lighter than the original, and you did not set the new cartridge for the proper tracking force, so the arm is "floating" rather than dropping to the record.
On most turntables, you rotate the weight at the rear of the arm until you set a tracking force of about 2 to 3 grams, but the scale markings will be wrong until you 'ZERO IT OUT" for the new weight of the new cartridge.
You need to turn the weight so that the cartridge "floats", not going up or down, and turn the scale at the front of the weight to zero without turning the weight itself. Just hold the weight still while turning the indicator scale to ZERO.
Once the scale says zero with the cartridge floating, then you can turn the weight to a position where the indication is between 2 and 3 and it should work properly.
If you don't understand how to do this refer to the manual. If you don't have the manual, get some help from an experienced turntable person.
Edited by commsysman - 7/15/12 at 10:01am