Needle sliding needle slides when trying to play a record

Incorrect weight on the stylus arm, or the speed is wrong, or the stylus is worn, or full of fluff.

The needle (stylus) has fallen off the end of the cantilever that contacts the record surface. U need a new stylus assembly.

OR, it is bent at an extreme angle and slides across the record surface.

Hi
It sounds as if the tone arm has become unbalanced. Make sure the turntable is on a firm flat horizontal surface and at the opposite end of the arm from the needle there will be a weight and a means of altering the position of weight on the tone arm. This weight keeps the needle on the record but only lightly when positioned correctly. If positioned too far from the pivot post the needle will as you have experience skip virtually straight across the record. You need to adjust the weight so that the needle just sits in the groove and plays without being too heavy. It is best to use a record you are not too worried about for this testing as the test record can sometimes get scratched.
Hope this is helpful, if so would you please register that with Fixya
Cheers

Does the needle actually contact the record? If not, you may be missing a "pad" under the record, or you may be simply missing the needle that needs to be there to follow the grooves.

There's too much weight on the stylus or the needle is not inserted correctly.

It could be 3 different things. The first is check the needle make sure its not dirty. the second is make sure the weight is set correctly. And the third is did you take the tone arm off the protective part that holds the tone arm in place when moving or travelling .

You either need a new stylus (there not called needles anymore) or the counterbalance has come loose (at the end of the arm). Therefore more weight needs to be applied.

There are a couple of reasons this is happening. First and formost gently lift the stylus arm and blow any and all dust off of the needle.You may even have to gently 'pinch' off any accumulated dust. Be careful since you don't want to pull the playing needle off.
This is a very common problem. If this does not help, you need a new stylus needle for the arm.

is the stylis touching record.
what turntables have you got?

you have unscrewed the suspension screw?

also check the needle for dirt and dust... try blue tacking a 5p coin to the top on the needle to give it a little more weight, if the needle stays in place then the arm balance if off, and unless there is a mechanism to adjust that on this turntable then i guess its a return!