Well, that depends on how did the screen get busted? It could be damage to the board or it could be stuck in a boot loop. If the boot loop is the case then I would create a recovery flash drive using a windows machine. I hope this helps :)
https://computers.tutsplus.com/tutorials/how-to-create-a-chromebook-recovery-usb-drive-using-chrome-os--cms-28842
https://support.google.com/chromebook/answer/1080595?hl=en