Acer Altos R510 - Manual (Page 153)

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1 Power down the system and disconnect the AC power.
2 Open the server.
3 Move the jumper from the normal operation position, CMOS Clear
by BMC, at pins 2 and 3 to the CMOS Clear Force Erase position,
covering pins 1 and 2 as indicated in the following diagram.
4 Reconnect the AC power, power up the system.
5 When the system begins beeping, power it down and disconnect
the AC power.
6 Return the CMOS Clear jumper to the CMOS Clear by BMC
location, covering pins 2 and 3.
7 Close the server chassis.
8 Reconnect the AC power and power up the system.