My Ticwatch Pro, like so many other watches went blank and wouldn't accept a charge, nothing on screen. Was starting the return process via Amazon, when I thought to try it one more time. Here's what I did to get mine working again.
Watch is off
Hold both buttons in until (~5 secondz) the recovery mode comes up.
The power (lower) button cycles through menu choices
The select (upper) buttons completes the selection.
I chose START
And it started!!!! It had been on a charger all day, but was as only at 84%. Placing it on the charger now charges it again!
Hope this helps some of you.