BIOS POST Code A9 Solution

If the BIOS POST code A9 appears when trying enter a server's BIOS at boot time, and the server is stuck, the BIOS must be reset.

Problem POST Code A9

When trying to change to the BIOS during the boot process, the message Entering Setup... still appears, but a change to the BIOS no longer happens. The POST code A9 can be seen in the lower right corner:

Version 2.17.1249. Copyright (C) 2018 American Megatrends, Inc.
Supermicro X10DRi/X10DRi-T Series BIOS Date: 02/06/2018 Ver: 3.0a
CPU : Intel(R) Xeon(R) CPU E5-2630 v4 @ 2.20GHz Speed : 2200MHz  Memory 524288MB
 DDR4 2134MHz

Press <DEL> or <ESC> to enter Setup.
Entering Setup...

















                                                                              A9

Solution

To solve the problem, perform the following steps:

1. Disconnect all power cables so that no power supply is connected to power..
2. Remove the BIOS battery from the motherboard.
3. Carry out a reset by short-circuiting the two metal connections on the battery socket with a metal tool for ~5 seconds.
4. Replace the BIOS battery and restore power to the system.

Further information

• FAQ 23462 (www.supermicro.com)

Author: Werner Fischer Werner Fischer, working in the Knowledge Transfer team at Thomas-Krenn, completed his studies of Computer and Media Security at FH Hagenberg in Austria. He is a regular speaker at many conferences like LinuxTag, OSMC, OSDC, LinuxCon, and author for various IT magazines. In his spare time he enjoys playing the piano and training for a good result at the annual Linz marathon relay.