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DIMM LEDs
1 Boot block/Clear CMOS switch (SW4)
The following table describes the function of each pin on the SW4 switch (Boot
block/Clear CMOS) on the system board.
Table 3. System board SW4 switch
Switch pin number Description
1 Boot block:
v When this switch is on 1, this is the normal mode.
v When this switch is toggled to On, this enables the
system to recover if the BIOS code becomes damaged.
See
the Hardware Maintenance Manual for information
about recovering from a BIOS update failure.
2 Clear CMOS:
v When this switch is on 2, this is the normal mode. This
keeps the CMOS data.
v When this switch is toggled to On, this clears the CMOS
data, which clears the power-on password and
administrator password.
Chapter 2. Installing optional devices 19
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