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Using the Clear CMOS Header (J38, Pins 9 - 10)
Using the Clear CMOS Header (J38, Pins 9 - 10)
You can use this header to clear the server's CMOS settings in the case of a system hang. For example, if the
server hangs because of incorrect settings and does not boot, use this jumper to invalidate the settings and
reboot with defaults.
Caution
Clearing the CMOS removes any customized settings and might result in data loss. Make a note of any
necessary customized settings in the BIOS before you use this clear CMOS procedure.
Step 1
Shut down and remove power from the server as described in
on page
29. Disconnect power cords from all power supplies.
Step 2
Slide the server out the front of the rack far enough so that you can remove the top cover. You might have to detach
cables from the rear panel to provide clearance.
Caution
If you cannot safely view and access the component, remove the server from the rack.
Step 3
Remove the top cover from the server as described in
Step 4
Locate header block J38 and pins 9-10, as shown in
Step 5
Install a two-pin jumper across pins 9 and 10.
Step 6
Reinstall the top cover and reconnect AC power cords to the server. The server powers up to standby power mode,
indicated when the Power LED on the front panel is amber.
Step 7
Return the server to main power mode by pressing the Power button on the front panel. The server is in main power
mode when the Power LED is green.
Note
You must allow the entire server to reboot to main power mode to complete the reset. The state of the jumper
cannot be determined without the host CPU running.
Step 8
Press the Power button to shut down the server to standby power mode, and then remove AC power cords from the
server to remove all power.
Step 9
Remove the top cover from the server.
Step 10
Remove the jumper that you installed.
Note
If you do not remove the jumper, the CMOS settings are reset to the defaults every time you power-cycle the
server.
Step 11
Replace the top cover, replace the server in the rack, replace power cords and any other cables, and then power on the
server by pressing the Power button.
Using the BIOS Recovery Header (J38, Pins 11 - 12)
Depending on which stage the BIOS becomes corrupted, you might see different behavior.
• If the BIOS BootBlock is corrupted, you might see the system get stuck on the following message:
• If it is a non-BootBlock corruption, a message similar to the following is displayed:
Cisco APIC M3/L3 Server Installation and Service Guide
86
Initializing and configuring memory/hardware
Shutting Down and Removing Power From the Server,
Removing the Server Top Cover, on page
Service Headers and Jumpers, on page
Maintaining the Server
30.
85.
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