Compaq Evo W8000 Hardware Reference Manual page 57

Hardware Upgrades
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9. Reattach the hard drive cables.
CAUTION: If only one processor is installed and you are replacing that
processor, be sure to install the processor in the primary processor
socket or your workstation will not function.
10. Reinstall the memory expansion board. See "Reinstalling the
Memory Expansion Board" in this chapter.
11. Reassemble the workstation.
When replacing the workstation access panel, be sure to tighten all
four thumbscrews.
A manual Hardware Abstraction Layer (HAL) upgrade is necessary
when installing a second processor after the system has gone
through the software unbundling process. If a second processor is
installed prior to unbundling, a manual upgrade is not necessary.
Compaq recommends that the software unbundling process be
completed prior to installing additional components. For information
on upgrading to a multiprocessor HAL, refer to the documentation
included in your processor upgrade kit.
Compaq Evo Workstation W8000 Hardware Reference Guide