Question Power on 1027GR-TSF then found system hangs at post code B4 when only CPU1 is installed. Answer The problem can be fixed by updating BIOS to R2.0 (X9DRGH3.117) or later version. Please download the BIOS from following URL. http://www.supermicro.com/support/bios/ 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) 9 G N N FAQ Stats FAQ ID Related Category / Keyword Date Posted Code 15834 N/A 03/22/13     Print Answer