CP is waiting for your answer to this question.? Until you tell it how you want to start up, nothing else will happen, including enabling terminals.
Type your answer starting with a slash (which tells Hercules that the line is input for the OS, not a Hercules command).? Since the WARM start already failed, I'd try /CKPT first, to try to save the SPOOL files, and if it fails, then /COLD, to start with an empty SPOOL.
After CP starts up, your /ENABLE ALL will throw a VM logo up on your WC3270 session, and you can log in.