I have two 3750G stacked and I am locked out of console access. The startup-config console settings are login and local. However, there is no local database, i.e, no username and password is specified. After attempting the normal password recovery (init_flash, load_helper, dir, rename, etc) and booting, the console screen still shows the "username" prompt. And since there is no username I am stuck. The switches are not currently in production so I can do anything to them to recover.
restart it and use the serial console to interrupt boot.
Once you're at the switch prompt, do the following:
Once it's booted, I'd suggest copying off the old config, modifying it with a user and then loading it back onto the switch.
Is this 3750 stacked sometimes you have to disconnect the stack if it is to go to password recovery.
Unless of course somebody configured no service password config.