Dell DX6000 - Manual (Page 179)

Jumpers and Connectors 179
NVRAM_CLR Pins 3 and 5
(default)
The configuration settings are retained at
system boot.
Pins 1 and 3 The configuration settings are cleared at
the next system boot. If the configuration
settings become corrupted to the point
where the system will not boot, install the
jumper and boot the system. Remove the
jumper before restoring the configuration
information.
Jumper Setting Description