If you've got two CPUs and if the configs are properly sync'ed between them you could reset the backup CPU, it shouldn't cause any problems but of course nothing is risk-free...
If you want to do that: connect to the CPU console port with your favorite terminal program, make sure you can get a login prompt, re-seat the backup CPU (its master light will always be off), stop its boot when you see the countdown, at the monitor prompt, copy the config:
cp /flash/config.cfg /pcmcia/config.cfg
and then 'pcmcia-stop'. You should be able to read the PCMCIA flash on your laptop. If you don't have a flash card you can get a compact-flash to PCMCIA converter and any formatted compact-flash card will work.
If you've only got one CPU or if the configs are not sync'ed between them restarting the primary CPU and reseting the passwords from its monitor prompt may be your only option. Good luck.