The Instruction Book for your scale can be found here:
Sounds like no power. Check for correct battery replacement; may need to verify that your replacement batteyr is still good.
1. Use 3 volt CR2032 lithium battery (as installed).
2. Open the battery compartment on the bottom of the scale.
3. Remove the old battery from the compartment.
4. Place the new battery with the "+" sign up into the battery compartment.
5. Replace the battery compartment cover.