[Ti] 1.5ghz Powerbooks: Where is the PMU button?

[John Griffin]

Great reply! Thanks Kynan, I have pasted your reply into a text file of
great replies that have appeared in this listserv.

I am glad I asked - even if it was really an academic question anyway. I
really can't remember when I last used the PMU button. I believe I might
have used the one that you stuck on the air vents on the bottom/side of the
128K Macs once or twice, and that's about it.

jg


Kynan Shook typed this message on 5/12/04 3:17 PM:

> Command-Control-Power is and always has been the preferable way to
> reset your computer.  On old ADB Macs, it sent a hardware reset signal.
> USB doesn't have this reset pin, so it has to emulate this reset
> (which means that if the computer crashes, it probably won't work -
> tell me, what's the use of a reset switch that doesn't work when you
> most need it? ;-)).  PowerBooks, both pre- and post-USB, have always
> used Command-Control-Power for reset, as the connector is over a
> proprietary bus.  Anyway, you should NEVER be using the PMU reset
> button to reboot the computer.  I think part of the reason why they
> moved it under the keyboard (and now made it a keyboard command - much
> like it was a number of years ago) is because people were using that
> instead of command-control-power.  So, moral of the story: if your
> computer crashes, use command-control-power.
> 
> I'm almost tempted to not mention the PMU reset combo, just because the
> vast majority of people will never need it anyway...  But I suppose
> I'll be nice.  ;-) Shut down your computer, then press
> Shift-Control-Option-Power briefly, being sure to not press any other
> keys such as Fn.  Do not press it a second time, as that can crash the
> Power Management Unit.  Wait 10 seconds, and turn the computer back on.
> The only time you should use the PMU reset is if your computer is not
> powering on, is only partially powering on, is having problems with
> either the battery or AC, has problems sleeping or waking, etc.  It is
> not intended to use for resetting after a normal crash, or for
> otherwise powering off the computer.
> 
> Another alternative to Command-Control-Power is to just hold down the
> power button for about 5 seconds.  Instead of rebooting, the computer
> will shut down forcibly.