If The Mainframe Does Not Power Up - HP 54721A User Reference

In Case of Difficulty
This chapter gives you a few helpful hints in case you are
experiencing difficulty in getting your plug-in to operate. The simple
check steps in this chapter are intended for you to perform. For
complete service information, refer to the Service Guide that was
supplied with the plug-in.
If the mainframe does not power up
□ Make sure that the mainframe is attached to a power source.
□ Make sure that the power switch on the mainframe is set to On, and that
the rear-panel line switch is set to On.
□ Remove the plug-in to see if the mainframe wiU power up without it.
If the mainframe still does not power up, refer to the Service Guide that was
supplied with the mainframe, or return the mainframe to your service
department.