What I like to do in situations like this is boot without startup-sequence, set echo on, as Thomas described, then execute s:startup-sequence. If you append >dh0:logfile it will save the buffer to disk. I don't know if you'll be able to see it on screen while it's executing - there's probably a way, but I'm not sure of the command syntax.
There's also an interactive mode - set interactive on, maybe? It'll ask you to confirm executing each line of the script.