Hello,I am Pete, and I'll be happy to assist with your question today.
What is the make and model number of your camera?
Did you connect a new Lightroom catalog to your account? Since Lightroom only supports one catalog at a time, the previous connected catalog will be removed.
Ensure the battery is fully charged.
Check that the memory card is installed correctly.
If it still won't work, let me know what it shows on the display when you try to tether...
Did you get my previous reply?
let me know what it shows on the display when you try to tether?
What version of firmware are you using on the camera?