Phono cable not caps to le with preamp?

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.