It is caused by lack of drivers and kext files of the older OS. You have
to remember that some of the newer MacPros where released after 10.6.3,
thus that version will unlikely have the necessary files to recognize
the hardware.
On 12/26/2012 7:47 AM, Dennis Degan wrote:
> On Dec 26, 2012, at 1:00 AM, John Moore wrote:
>
> > So I got a new 12 core 2.6GHz MacPro and it came with 10.8. I took
> the startup drive and reduced the size of the startup partition and
> created 4 250GHz partitions. I figured I'd just stick in my 10.6.3 OS
> DVD and install 10.6.3 to one of the new empty partitions but all I
> get is the apple logo grey screen but no swirling sproket thingy. I
> found this on the internet:
> > Zap the PRAM and Reset the SMC, pop in the DVD, open System
> Preferences->Startup Disk, select the mounted SL install disc, and
> click on Restart button.
> > I tried choosing the 10.6.3 installer DVD as startup and doing a
> restart but same result. I pulled the drive and mounted it on my MBP
> 10.6.8 laptop and installed 10.6.3 on one of the new partitions. I
> put that back in the macpro but I still get the Apple logo grey screen
> and nothing else. I brought the drive back to the MBP pro and am in
> the process of updating it to 10.6.8 on it and then trying it back in
> the MacPro. At my main client they got some new 12 cores a few months
> back and installed 10.6.8 on them some how. I do recall from past
> experience there seemed to be some big under the hood changes when
> going from 10.6.3 to 10.6.8 when I was setting up some Avid startup
> drives. Anybody got any suggestions.
>
> As I recall:
>
> As you've discovered, your new MacPro is hardware limited to prevent
> you from CREATING a startup drive with anything earlier than 10.8.x on
> it. But that doesn't mean you are prevented from RUNNING anything
> older as a startup drive. You may or MAY NOT have success with a
> 10.6.8 startup on your new MacPro depending on whether Apple set a
> hardware startup limit at 10.6.x. You may have to go to 10.7.x to get
> this to work on your particular MacPro. Or you may not be able to do
> it at all below 10.8.x. Your client's MacPro's may simply have a
> different hardware limit installed; not much you can do about that.
> I did this OS downgrade once long, long ago, but it was on a Power PC
> machine, so it would be of no help to you.
>
> Dennis Degan, Video Editor-Consultant-Knowledge Bank
> NBC Today Show, New York
>
>
>
>
>
> [Non-text portions of this message have been removed]
>
>
>
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