Hi Stewart
Google search for 'cuda' (sic) revealed this:
From
http://www.peachpit.com/features/article.asp?st={4F799054-DB5F-40DA-
B919-C3FBC49178CA}&session_id={C2DBCA3B-D98D-4635-961E
-63170342FC1A}&product_id={3B774831-418A-44DA-BD79-98BE6B193848}
Technically Speaking: The Cuda Button and the PMU -- Solving Startup
Problems
Cuda button
Most recent Mac models have a small, circular, usually red, button on
the logic board called the Cuda button. When you press the Cuda button,
it resets the Mac's "permanent" settings even more thoroughly than a
reset of the PRAM. You should only need to use this button as an
absolute last resort for PRAM-related problems.
Its location varies from model to model, but a visual scan of the logic
board should reveal it. On the iMac it is located near the RAM modules.
On the Blue and White G3 Macs, if you open the computer, you will see
two buttons behind the PCI slots marked "Power On." The left one (as
you face the front of the Mac) is the normal Power button. The right
one is the Cuda button.
Pressing the Cuda button is often advised if your Mac does not start up
after installing a RAM or processor upgrade. The Cuda button may also
help if your hard drive is unwilling to even start spinning at startup.
It is similarly advised any time the Mac completely fails to start up,
especially if the failure is very early in the startup sequence (such
as a failure to even produce a startup tone). Also possibly helpful for
this problem is to remove and reseat all RAM, because defective RAM can
also cause these symptoms.
One other problem where pressing the Cuda button may help is if your
monitor screen goes black and stays black even though its power light
is on and everything else seems to be working normally. If restarting
and zapping the PRAM has no effect (or only works sporadically), try
the Cuda button.
More technically, what the Cuda button does is reset the data stored in
the Cuda Microcontroller Chip. According to Apple, the main functions
of this chip are to:
•
Turn system power on and off.
•
Manage system resets from various commands.
•
Maintain parameter RAM.
•
Manage the Apple Desktop Bus (ADB).
•
Manage the real-time clock.
•
Let an external signal from either Apple GeoPort serial port control
system power.
On 10 Jan 2004, at 11:12am, Stewart Woods wrote:
Goeffrey's trick has done the job....the button was black, not red!
All is now back to normal
What is that button, and any ideas what happened to cause this?
cheers,
Stew
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