@EricP1961
On the back of desktop model cases, there are often slider switches that can be moved between 50Hz and 60Hz.
If you are in the US, you would need 60Hz and would need to check the case to ensure the switch is set properly.
If your are outside the US, you might need 50HZ -- but you would need to check to find out what your mains uses.
I am a volunteer and I do not work for, nor represent, HP