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Cisco UCS C460 Server Installation and Service Guide
OL-22326-01
Chapter 2 Installing the Server
Motherboard Jumpers for Clearing BIOS Settings
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 2-14). 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.
Note The Clear CMOS function on header J5C2 does not restore the defaults to CIMC-controlled BIOS setup
parameters. If you need to restore defaults on CIMC-controlled BIOS setup parameters, go to the CIMC
GUI’s Server—BIOS page, then click Configure BIOS to open the Configure BIOS Parameters
window. On that window, use the Restore Defaults button to restore 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 and leave it there for about 5 seconds (see
Figure 2-6 on page 2-14).
Step 5 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 6 Replace the top cover.
Step 7 Replace the server in the rack, replace cables, and then power on the server by pressing the Power
button.
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