Question I have a motherboard, X10SL7-F, with UDIMM ECC memory. But I saw BIOS post code always hanging at "55" and not able to get into BIOS. What is the meaning of post error code "55"? Answer Post error code 55 is meaning "no memory installation". You will need to ensure UDIMM ECC memory installed properly in blue slot in X10SL7-F board. 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) N Y Q T FAQ Stats FAQ ID Related Category / Keyword Date Posted Code 17798 BIOS: - AMI BIOS 01/07/14     Print Answer