Specifications

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2-22
Cisco UCS C460 Server Installation and Service Guide
OL-22326-01
Chapter 2 Installing the Server
Configuring BIOS Settings and Updating BIOS Firmware
Using a Clear CMOS Jumper on Header J5C2
The J5C3 jumper is a 3-pin header on the motherboard (see Figure 2-6 on page 2-20). You can use this
procedure 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.
Step 1 Power off the server as described in the “Shutting Down and Powering Off the Server” section on
page 3-6.
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 as described in the “Removing and Replacing the Server Top Cover” section on
page 3-7.
Step 4 Install a shorting jumper to pins 2 and 3 of the J5C2 header (see Figure 2-6 on page 2-20).
Step 5 Replace the top cover.
Step 6 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. This is
because the state of the jumper cannot be determined without the host CPU running.
Step 7 Press the Power button to shut down the server to standby power mode.
Step 8 Remove the top cover from the server.
Step 9 Replace the jumper to the default pins 1 and 2 on the J5C2 header.
Note If you do not remove the jumper, the CMOS settings are reset to the default every time you
power-cycle the server.
Step 10 Replace the top cover.
Step 11 Replace the server in the rack, replace cables, and then power on the server by pressing the Power
button.