[G4] G4 Dual 867 MDD RAM question

[mactechlists at cox.net]

Keep an eye on things. I take care of 30 Mac computers at a weekly 
newspaper. They have several of the original Mirror Door dual boot G4's 
running 867 MHz. I had very negative results when placing the PC2700 
RAM in these machines, - - even when they passed the Apple Hardware 
test and the TechTool test. All problems disappeared when the PC2700 
RAM was removed. I had to find PC2100 RAM for them.

SE



On Mar 17, 2006, at 3:57 PM, Aaron wrote:

> Thanks to all responders.
>
> I received my new RAM:
>
>> "Kingston 512 MB 333 MHZ DDR-PC2700 DIMM CL2.5 PC Memory"  $44.77 
>> each (including free shipping)
>> which is listed at <http://www.amazon.com/gp/product/B00006HVT4/>.
>
> and installed it Wednesday night. I left in the old PC2100 RAM stick, 
> so there's now 1.5 G in the computer.
>
> With one MAJOR exception, everything has been fine since then. The 
> exception is that, a few hours after the installation, I got what is 
> probably a "Kernel Panic". Specifically, I saw the box on my screen in 
> about 5 languages telling me that I had to restart the machine by 
> pressing the power button!
>
> I restarted it successfully and have had no problems since, but I'm 
> concerned that there may be a defect in the new RAM that will only 
> occasionally show up.
>
> When I first restarted the computer after installing the new RAM, I 
> followed a procedure that I had intended to follow after installing 
> some Apple update (a security update, IIRC) a few weeks ago. (It was 
> described by Vincent Cayenne <vcayenne at mac.com> on the  OS X 
> Discussion List <osx at osxlist.com>, a good list for intermediate to 
> advanced OS X users.)
>
> 1) I held down the command-option-P-R combination until the machine 
> chimed three times.
>
> 2) I then held down the command-option-O-F combination to get into 
> open firmware.
>
> 3) I entered the following commands, one per line:
>
> set-defaults
> reset-nvram
> reset-all
>
> 4) The machine restarted and I held down the command-S combination to 
> get to the single-user command line interface appeared. When the 
> scrolling stopped, I entered the following command:
>
> applejack auto restart
>
> (all lower case!) and pressed Return. (I had installed applejack 
> previously.)
>
> The machine then rebooted into OS X (its 10.3.9, BTW) and has worked 
> fine since except for the one unexplained crash mentioned above. The 
> machine is a helluva lot faster now.
>
>  - Aaron
> _______________________________________________