Question We have built and shipped one server with 2 nodes populated. Each node has 1xSSD/CPU/4GB RAM/PCIe slot populated. The customer powered this unit and got an error message “system initializing 91” . Do you know what is the reason? Answer Postcode 91 is at the beginning of the bios starting to initialise the PCIe slots/cards. First please check if an add-on card is causing this problem. Was this FAQ helpful? YES      NO Enter Comments Below: Note: Your comments/feedback should be limited to this FAQ only. For technical support, please send an email to support@supermicro.com.  Enter your email address below if you'd like technical support staff to reply:  Please type the Captcha (no space) 4 T Q Q FAQ Stats FAQ ID Related Category / Keyword Date Posted Code 18864 Other: - Assemble - Support Information 06/20/14 PD     Print Answer