HP Vectra VL400 Installation Manual page 34

Desktop
Replacing the Power Protection Device (some models only) 1 of 2
WARNING
For your safety, never remove the PC's cover without
first removing the power cord from the power outlet
and any connection to a telecommunications network.
If a power protection device is fitted to your PC, you
must remove the power cord then wait for a complete
shutdown of your system before removing the cover.
Remove the power protection device cables before any
servicing operation. Always replace the cover before
switching the PC on again.
Installing Components in the Desktop 34 of 36