Apple Macintosh Performa 5400 Series - Manual (Page 124)

11 Pull the logic board all the way out and set it on a clean, flat, stable surface. Rest the end
of the board on a thick magazine or a thin book to protect the components underneath.
What you do next depends on whether you’re installing a PCI card in the PCI
slot or installing a modem or Ethernet card in the communication slot. Go to
the section that pertains to the item you are installing.
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Rest the logic board on a clean, flat, stable surface.
Place a thick magazine under this end of the logic
board to help protect the components underneath.
123 Installing an Expansion Card