Wiktionary
vb. (present participle of boot up English)
Usage examples of "booting up".
Right when it starts booting up, start pressing the Pause Break key and do not let it detect your drives.
She was already a third of the way to the door-what did she care about a Mac booting up?
During the process of booting up, the screen was briefly a most curious shade of green.
It wasn't very long before we had Oharu stretched out on his bed with his arms and legs duct-taped together and I was booting up Jesse's computer, which I had found in Oharu's desk drawer.
Cassie heard the familiar whirring sound of the computer booting up.
He could look back on a past with function keys and five-and-a-quarter-inch disks, and when booting up your computer meant a whole series of commands and disturbing messages (bad command or file name).
Peter said as he sat at the desk booting up the computer, 'That's one facet of my mother I won't miss.