Wiktionary
comes to life
vb. (en-third-person singularcome to life)
Usage examples of "comes to life".
It's a bit like deciding exactly when a chicken comes to life: you don't actually see it until the chicken pops out of the egg but you know it's alive even when it's invisible, inside the shell.
After a moment the screen comes to life, displaying the symbol of the Cthulhu News Network.