@Gertjan:
https://www.netgate.com/docs/sg-2220/connect-to-console.html
You''re using a PC ? A COM port is present and you use it when starting Putty ?
edit : Putty as a COM (serial or RS232) client won't help you much to clarify the situation. As per instructions,, Putty connects to a COM port (created by the driver that comes along with the Serial-to-USB cable - check that this COM port was created when the drivers was installed AND the cable is connected ) and will 'open' this port ans show on screen everything that's comes in.
Bit rater, stop bits and other parity stuff becomes important, using the wrong settings on both sides of the COM port will produce rubbish at best, nothing at worst.
From what I understand reading the doc "SG-2220", the BIOS will init his COM port with known settings : the settings on the PC COM port should match exactly.
That's about it.
Thanks Gertjan. I found that while I couldn't access the console, I can see system logs as the PfSense is booting up.
There appears to have been a different issue as well though - so I'm not sure how the whole solution got messed up this badly since I configured it initially. Since I can access the boot menu, I tried to boot into single user mode to reset the password like that. However, the mount command gave an error indicating that I need to run fsck. I tried it using journaling first, which completed successfully but resulted in a kernel panic after I ran /etc/rc.initial.password. That was yesterday. This morning I gave it another shot without journaling, which worked. I'm finally able to access the web interface again, but still no console if I connect after it booted. It's weird. It sounds like the plug has been pulled on it a couple of times though, resulting in a hard shutdown.
Thanks again for your help, much appreciated!