I'm trying to reset the password on a Cisco 3750 switch, but can't seem to get it to accept a Break command during bootup to get into ROMMON. Its got Password Recovery enabled. I'm connected to the console with the official Cisco blue serial cable (tried two in fact), tried Putty and Hyperterminal, tried XP and WIN7 on two different PCs, tried all the Cisco Ctrl + Break suggestions, tried also the spacebar trick at 1200bps. The flash memory is not physically removable (which I found on Google as a tip!). Whatever I do, the machine just trundles on loading normally all the way to a final prompt - no strange messages or other clues. Any ideas?