Apple Power Macintosh 5400 series - Manual (Page 164)

6 Plug the cables back into the computer.
Your computer is now ready to turn on and use.
Note: If your computer will not start after you’ve installed an expansion card,
DRAM, or the High Performance Module, you may need to press the reset
button on the main logic board. See the instructions listed under the symptom
“The computer does not start and you have just installed DIMMs, a High
Performance Module (256K level 2 cache), or expansion cards” in “Solutions
to Common Problems” in Chapter 5 of this manual.
WARNING Never turn on your computer unless all of its internal and
external parts are in place. Operating the computer when it is open or
missing parts can be dangerous, and can damage your computer.
152 Appendix B