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XW4550 workstation control panel (front panel) pinout

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I have a HP XW4550 workstation mother board and I am trying to find information on the pinouts for the front panel connections such as power button, reset button, power LED, HD LED, and etc. It is an 18 pin connector with one missing pin. I have found a diagram for the same type of connector on a XW4600 workstation but I don't know if the pinouts are the same for the XW4550 as the XW4600

Please help.



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