Cisco ASA5520 stuck at Booting system, please wait...

I have two ASA5520 firewalls running in an Active/Standby setup. One of them did not start and displayed the following message on the console during boot:


Booting system, please wait...

From my experience, the message Booting system, please wait... can be caused by a faulty memory, and so I was going to check the hardware.

The ASA5520 has four memory slots, where two of them are occupied and give the system 2GByte of RAM. I removed one of them, booted the ASA5520, and it came up as expected. To cross-check, I removed the other memory, inserted the one I removed first and booted the ASA5520. Same error: Booting system, please wait.... Therefore I knew the memory I removed first is the faulty one.

Cisco ASA5520 identifying faulty memory

Cisco ASA5520 identifying faulty memory

By booting up with one memory installed (1 GByte instead of 2 Gbyte) the ASA5520 shows a warning that the memory requirements are not met to run with the ASA software I am normally running:


Platform ASA5520

Use BREAK or ESC to interrupt boot.
Use SPACE to begin boot immediately.
Boot interrupted.

Management0/0
Link is UP

MAC Address: hhhh.hhhh.hhhh

Use ? for help.
rommon #0〉
*************************************************************************
**                                                                     **
**   *** WARNING *** WARNING *** WARNING *** WARNING *** WARNING ***   **
**                                                                     **
**          ----〉 Minimum Memory Requirements NOT Met! 〈----            **
**                                                                     **
**  Installed RAM: 1024 MB                                             **
**  Required  RAM: 2048 MB                                             **
**  Upgrade part#: ASA5520-MEM-2GB=                                    **
**                                                                     **
**  This ASA does not meet the minimum memory requirements needed to   **
**  run this image. Please install additional memory (part number      **
**  listed above) or downgrade to ASA version 8.2 or earlier.          **
**  Continuing to run without a memory upgrade is unsupported, and     **
**  critical system features will not function properly.               **
**                                                                     **
*************************************************************************

Because I do not want to "downgrade" my ASA software, I keep this one running in my Active/Standby setup and ordered a memory replacement, which will hopefully arrive soon.

And if you enjoy some hardware photos, here is one of my ASA5520's running as Active/Standby. Enjoy!

Cisco ASA5520 Active/Standby

Cisco ASA5520 Active/Standby

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