Question I have a X9DRH-7TF. I just updated the BIOS to 3.0, but now it is stuck on B2 at POST. What does the POST code B2 mean? Answer If you are using a KVM switch for the monitor and USB keyboard/mouse, please remove it and plug the monitor directly to the motherboard. Plug the keyboard and mouse to the rear IO USB ports. Please try to boot it up again. B2 has to do with legacy devices, and sometimes the KVM might cause the system to be stuck on B2 at boot-up. If you are still having problems, please try to use another monitor, or mouse, or keyboard. 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) E D E Y FAQ Stats FAQ ID Related Category / Keyword Date Posted Code 17186 BIOS: - AMI BIOS Peripherals: - Monitor 10/07/13     Print Answer