Sonnet Technologies Crescendo_L2 Processor Upgrade - Manual (Page 17)

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Power Macintosh 5400, 5500, and Performa 54XX Installation
3. Open your Power Macintosh by first loosening the three security
screws on the back of the case (Figure 1) with a medium
Phillips screwdriver.
4. Note the two back panel latches underneath the case (Figure 2).
You will need to unlatch them when removing the back panel
from the computer.
Figure 1: Remove the three security screws
Figure 2: Back panel latches underneath case
security screw security screw
security screw