I do not know. I am not sure how I can go about testing this either.
From the Mac mini (Early 2006) Service Source manual:
No Power
The Mac mini wont turn on, no startup chime, no drive or fan sound, maybe no
power on LED
- Make sure that the power cord is plugged into a working wall outlet, and that its properly connected to the power adapter. (To check if the wall socket is working, plug in a lamp or other electrical device.)
- Make sure that the power adapter is properly connected to the power port on the back of the computer.
- Disconnect all accessories that are plugged into the computer, such as a printer, hub, or iPod.
- Reset the SMC. (Refer to Reset the SMC mentioned in this chapter.)
- Try plugging a different power cord into the computer (if you have a working one available). If the computer starts up, replace the old power cord.
- Try connecting a different power adapter to the computer (if you have a working one available). If the computer starts up, replace the old power adapter.
- Replace the logic board.
How to Reset the SMC
The SMC (System Management Controller) is a microcontroller chip on the logic board that
controls all power functions for your computer. If your computer is experiencing any power issue,
resetting the SMC may resolve it. The SMC controls several functions, including:
- Telling the computer when to turn on, turn off, sleep, wake, idle, and so on.
- Handling system resets from various commands.
- Controlling the fans.
Note that resetting the SMC does not reset the PRAM. Resetting the SMC will not resolve issues
in which your computer is unresponsivein these situations, restarting your computer will
generally suffice. If your computer isnt responding, perform these steps one at a time, in this
order, until the issue has been resolved:
- Force Quit (Option-Command-Escape).
- Restart (Control-Command-Power).
- Force Shut Down (press the power button for 10 seconds).
Resetting the SMC can resolve some computer issues such as not starting up, not displaying
video, sleep issues, fan noise issues, and so on. If your computer still exhibits these types of issues
even after youve restarted the computer, try resetting the SMC. To reset the SMC :
- Turn off the computer by choosing Shut Down from the Apple menu, or by holding the power button until the computer turns off.
- Unplug all cables from the computer, including the power cord.
- Wait 10 seconds.
- Plug in the power cord while simultaneously pressing and holding the power button on the back of the computer.
- Let go of the power button.
- Press the power button once more to start up your computer.