Cisco UCS C250, Installation And Service Manual

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Cisco UCS C250 Server Installation and Service Guide
OL-20888-02
Chapter 2 Installing the Server
System BIOS and CIMC Firmware
Using a Clear CMOS Jumper on Header P35
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 3-9 .
Step 2
Disconnect all power cords from the power supplies.
Step 3 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 4
Remove the top cover as described in the “Removing and Replacing the Server Top Cover” section on
page 3-10 .
Step 5 Remove the clear air baffle that covers the motherboard. Loosen the six thumbscrews, and then lift the
baffle up and out of the server.
Step 6
Install a shorting jumper pins 5 and 6 of the P35 header (see Figure 2-5 on page 2-14 ).
Step 7
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 8
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 9
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 10 Remove the top cover from the server.
Step 11
Remove the shorting jumper from the header pins.
Note
If you do not remove the jumper, the CMOS settings are reset to the default every time you
power-cycle the server.
Step 12
Reinstall the air baffle and the top cover.
Step 13 Replace the server in the rack, replace power cords and any other cables, then power on the server by
pressing the
Power button.