Phono cable not caps to le with preamp?

My phono pre gives these instruction and has these grounding switches as part of its circuit.

Improper grounding of an outboard phono sections can often result in excessive hum. Since the grounding on every sytem is different, it is impossible to provide a uniform grounding strategy that will work for every system. Be assured that with correct grounding almost all audible hum can be eliminated. If you are experiencing some hum, try the following:

1. Be sure to have the phono pre plugged into the same outlet or power strip as your preamplifier.

2. Connect the turntable ground to the ground lug on the rear of the Phon Pre

3. You may need to connect a ground wire from the Phono pre to your preamplifier.

4. Try different combinations of the internal grounding switches g1-g4 under the Phono Pre access panel
    

   

   Grounding switches g1 through g4:

   The four small grounding switches g1, g2, g3, g4 will most often be set in the forward position as shown in the preceding photographs. If you are experiencing excessive hum you can try moving them in the various possible configurations g1, g3 forward g2, g4 to the rear, etc.. Some cartridges that share internal grounding between channels may require that one channel be grounded while the other is not (e.g. g1, g2 forward and g3, g4 to the rear).

   

Some or all of the above should eliminate most hum. If this fails to cure the hum, call customer service for further advice.
If not GoChurchGo trying Thoughts & Prayers may work

Bicycle, am I correct in the belief that the blurb you quoted is from your owners manual and that your phono stage is not identical to the OP’s? If so, the bit about playing with internal ground switches is useless to the OP, because the vast majority of phono stages provide no such options. However the verbal points to consider do apply to most situations. I think his new phono most likely has an internal short owing to a cold solder joint or to a broken one.

He never mentioned what kind of phono amp he had, knowledge is never useless,

The last suggestion to call the manufacturer customer service is probably his best bet at this stage (pun intended)I see you’ve got 12.5 thousand posts. How do you have time to ever listen to music.

The original poster wasn’t even aware he had to ground his turntable so I’m giving him as much information as possible,

Just noticed the ops post is from January so he’s probably taken care of it by now. Carry on my wayward son 

bicycle, "knowledge is never useless"????

It's true; I have too many posts here. But I think that is over a 15-20 year period and includes the duration of the pandemic when I was going out of my mind with boredom and the confinement.

On the other hand, can you name your phono stage? And by the way, you don't necessarily HAVE TO ground your turntable.  It's something to try if you have hum. I've got 5 turntables up and running, and none of them is separately grounded to the phono stage(s).  Yet I have no issues with hum.