HP 7925D Service Manual page 146

Removal and Replacement
f. Disconnect the power panel assembly grounding wire
from the grounding stud at the bottom rear of the
enclosure.
g. Remove the four screws attaching the power panel
assembly to the enclosure and remove the assembly.
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7925
To replace the power panel assembly, perform the above
steps in the reverse order. When the power panel assembly
is replaced, ensure the grounding wire is connected to the
enclosure.