A late 2007 Mac Pro (2,1) no longer boots into 64-bit Snow Leopard

In Snow Leopard 10.6.7, my late 2007 Mac Pro (2,1/3.0 GHz/Dual Quad-Core Intel Xeon) no longer seems to be booting into 64-bit mode. I've tried holding down the 6 and 4 keys during startup and even used a Terminal sudo command to force the machine to always boot into 64-bit mode. No matter what I try, an About This Mac>More Info>Software check only reports the following:
     64-bit Kernel and Extensions: No
Before I upgraded from Leopard 10.5 to Snow Leopard 10.6, I carefully researched this, and this Mac Pro model specifically was listed by Apple as being capable of 64-bit booting — meaning that it would utilize at least some extra memory. At the time, under OS 10.5 and early versions of 10.6, when I used this Terminal command...
     ioreg -l -p IODeviceTree | grep firmware-abi
...my Mac Pro 2,1 returned this response:
     "firmware-abi" = <"EFI64">
As a result of my tests and research, I upgraded the installed SDRAM from 4MB to the theoretical maximum Apple indicated this model could support (16MB) so that Adobe Photoshop 12 (CS 5) would fully utilize extra installed memory under Snow Leopard. While using the first versions of 10.6 Snow Leopard, the machine worked fine in 64-bit mode. Now, in the wake of the 10.6.6 or the 10.6.7 update (I didn't notice which), I find that this model no longer even reports itself as being 64-bit capable, though it once did.
Now, the aforementioned Terminal query returns this response:
      "firmware-abi" = <"EFI32">
Also, the Library>Preferences folder does even not contain a file called "com.apple.boot.plist," which some owners have reported editing to force 64-bit booting.
The thing is, I spent a fair amount of money upgrading this machine to the maximum amount of SDRAM supported. I purchased it because it was advertised as being 64-bit capable and I upgraded it because Apple originally reported it as being a 64-bit model. Now, I'm not sure if the extra memory I added is being fully utilized, though Photoshop does report seeing 15547MB of available memory.
Have any other owners of these second-generation Intel Mac Pro's encountered this? Does anyone know what's going on? Am I doing something wrong when checking for the 64-bit installation or architecture? Is Snow Leopard 10.6.7 mis-reporting the architecture for this model? Or did Apple silently withdraw 64-bit support for this machine in a recent OS update?

Hatter: Thanks for the feedback and links. Well, as described in one of the threads you linked to, the document below reinforces your assertion that only Mac Pro's 3,1 or later (early 2008) support 64-bit booting in Snow Leopard:
http://support.apple.com/kb/HT3770
However, if you asked me in court, I would swear on a stack of Bibles that sometime in the past, I read an Apple document indicating that the Mac Pro 2,1 supported 64-bit booting and I really thought I recalled booting this particular machine into 64-bit mode under early versions of Snow Leopard.
I guess I'm mistaken. Certainly, this issue can be confusing. When I read them out loud to myself, even perfectly-written, accurate explanations on the subject can sound like a circular, non-sensical George Bush rationalization being delivered by comic Will Ferrell. I must not be correctly recalling the details of booting into 64-bit mode with this machine. And I guess that since Photoshop has its own memory management scheme, and I only have 16 gigabytes of SDRAM installed anyway, it doesn't matter that much. Furthermore, in one of your links, Jason Snell of Macworld writes:
"...If you’re running a Mac powered by an Intel Core 2 Duo processor or an Intel Xeon processor, your Mac is 64-bit capable. And Snow Leopard runs 64-bit-capable applications in 64-bit mode regardless of whether it’s booting into a 64-bit or 32-bit kernel. In fact, the only big advantage of booting into a 64-bit kernel would be the ability to use more than 32 gigabytes of RAM..."

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What is a good replacement for the ATI Radeon X1900 XT on a late 2007 Mac Pro

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<http://store.apple.com/us/product/MC742ZM/A/ati-radeon-hd-5770-graphics-upgrade- kit-for-mac-pro-(mid-2010)>

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nfoo wrote:
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What has to be done:
Create a new partition on the hard drive.
Get a clone of a 10.6.8 Snow Leopard system. Put the cloned Snow Leopard system onto the new partition.
Step One: Create a new partition on the hard drive
To resize the drive and create a new partition do the following:
1.           Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
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Step Two: Obtain a clone of a Snow Leopard system:
You will need access to a Mac already running Snow Leopard. You will need a 16 GB USB flash drive or an external hard drive to which you can clone the Snow Leopard system from the Mac that has Snow Leopard installed. Alternatives are:
Option One:
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Late 2007 MacBook White Will Not Update After Installation of 10.6 Snow Leopard

I'm wondering if anyone can help me with this problem and hopefully diagnosis it as a non-motherboard or logic board issue.
Had 10.7.8 installed successfully for 4-6 months, upgraded from 10.6.8, the end of Snow Leopard.
Had to force shut down computer after external hd wouldn't eject. After restarting, computer never restarted (was stuck on Apple/spinning wheel).
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I've literally tried everything. I'm able to reinstall base OS' but not update to recent versions either 10.5.8 or 10.6.8 to upgrade back up to 10.7.5 Lion.
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It'd be great not to have to throw this thing away as it's still a solid work/office computer.
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I suggest for the future you read this:
Make Your Own Mountain/Lion Installer
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2. Get a USB flash drive that is at least 8 GBs. Prep this flash drive as follows:
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c. Under the Volume Scheme heading set the number of partitions from the drop down menu to one.
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d. Select the volume you just created (this is the sub-entry under the drive entry) from the left side
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e. Set the format type to Mac OS Extended (Journaled.) Click on the Options button, check the
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3. Locate the saved Mountain/Lion installer in your Downloads folder. CTRL- or RIGHT-click on the installer and select Show Package Contents from the contextual menu. Double-click on the Contents folder to open it. Double-click on the SharedSupport folder. In this folder you will see a disc image named InstallESD.dmg.
4. Plug in your freshly prepared USB flash drive. You are going to clone the content of the InstallESD.dmg disc image to the flash drive as follows:
a. Double-click on the InstallESD.dmg file to mount it on your Desktop.
b. Open Disk Utility.
c. Select the USB flash drive from the left side list.
d. Click on the Restore tab in the DU main window.
e. Select the USB flash drive volume from the left side list and drag it to the Destination entry field.
f. Drag the mounted disc icon from the Desktop into the Source entry field.
g. Double-check you got it right, then click on the Restore button.
When the clone is completed you have a fully bootable installer that you can use without having to re-download Mountain/Lion.
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Macbook pro 6,2 doesn't boot in to retail snow leopard disk.

Hey everyone I got a little problem here, see I need to restore my macbook because I need to run windows in order to update my Blackberry. Bootcamp won't let me partition my drive because some files can't be moved, I did a time machine back up and I was ready for a restore. One problem the Mac OS X recovery disk that came with the macbook are lost in space some where, I did however get a retail copy from a buddy of mine. I popped it in held down the C key, apple logo came up, but no spinning wheel at the bottom. Anyone know around this?
Thanks - Mark

Pondini has identified the problem: There is no retail OS X disc that can boot a MBP 6,2. The machine requires a newer build of the OS than the most recent Snow Leopard retail disc contains. You'll need to order a replacement for the installer disc that came with your computer:
Apple Customer Relations 1-800-767-2775
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Message was edited by: eww

I just moved from a G5 PowerMac to a Mac Pro with one drive running Yosemite and one running Snow Leopard, Do I need Lion to be able to upgrade iPhotos

How can I see my iPhotos from a G5 PowerMac on a MacPro running Yosemite and Snow Leopard? Is Lion a more advance system that Snow Leopard?

The last iPhoto version you can run with Snow Leopard is iPhoto 9.2.4, and Yosemite needs iPhoto 9.6.
Move your photos to your Yosemite partition, if you want to use iPhoto with Photo Streams and other iCloud features.
As you are asking about Lion, you can run iPhoto iPhoto 9.2.3 or iPhoto 9.2.4 both with Lion and SnowLeopard, but there is no iPhoto version, that runs both on Yosemite and Snow Leopard, or Lion and Yosemite.

2007 Mac Pro (10.6.8) cannot upgrade to Yosemite?

Hi everyone. first time posting. I've just tried to upgrade my Late 2007 Mac Pro desktop to Yosemite (from Snow Leopard 10.6.8) and got this message:
"This version of OS X 10.10 cannot be installed on this computer."
I dug a bit deeper.... and found this:
To install Mavericks, you need one of these Macs:
iMac (Mid-2007 or later)
MacBook (13-inch Aluminum, Late 2008), (13-inch, Early 2009 or later)
MacBook Pro (13-inch, Mid-2009 or later),
MacBook Pro (15-inch or 17-inch, Mid/Late 2007 or later)
MacBook Air (Late 2008 or later)
Mac mini (Early 2009 or later)
Mac Pro (Early 2008 or later)
Xserve (Early 2009)
So, my question is then how can I upgrade the OS to a late 2007 make and model of Mac Pro? Is there a middle step to upgrade like there was with snow leopard? A quick google search did not turn up much. I've got enough RAM, HDD space, etc. This is the only sticking point.
Is this year model stuck with snow leopard?
Any help would be much appreciated.
thanks
clane

You have a Mac Pro 2,1 model which cannot run anything above Lion 10.7.5. You don't have a MP Early 2008 model.
Upgrading to Yosemite
You can upgrade to Yosemite from Lion or directly from Snow Leopard. Yosemite can be downloaded from the Mac App Store for FREE.
Upgrading to Yosemite
To upgrade to Yosemite you must have Snow Leopard 10.6.8 or Lion installed. Download Yosemite from the App Store. Sign in using your Apple ID. Yosemite is free. The file is quite large, over 5 GBs, so allow some time to download. It would be preferable to use Ethernet because it is nearly four times faster than wireless.
    OS X Mavericks/Yosemite- System Requirements
    Macs that can be upgraded to OS X Yosemite
         1. iMac (Mid 2007 or newer) - Model Identifier 7,1 or later
         2. MacBook (Late 2008 Aluminum, or Early 2009 or newer) - Model Identifier 5,1 or later
         3. MacBook Pro (Mid/Late 2007 or newer) - Model Identifier 3,1 or later
         4. MacBook Air (Late 2008 or newer) - Model Identifier 2,1 or later
         5. Mac mini (Early 2009 or newer) - Model Identifier 3,1 or later
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         7. Xserve (Early 2009) - Model Identifier 3,1 or later
To find the model identifier open System Profiler in the Utilities folder. It's displayed in the panel on the right.
     Are my applications compatible?
         See App Compatibility Table - RoaringApps.
Upgrading to Lion
If your computer does not meet the requirements to install Mavericks, it may still meet the requirements to install Lion.
You can purchase Lion at the Online Apple Store. The cost is $19.99 (as it was before) plus tax. It's a download. You will get an email containing a redemption code that you then use at the Mac App Store to download Lion. Save a copy of that installer to your Downloads folder because the installer deletes itself at the end of the installation.
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       1. Mac computer with an Intel Core 2 Duo, Core i3, Core i5, Core i7,
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November 2007 Mac Pro with NVIDIA Quadro 5600 Win only

Hi,
so I have a NVIDIA quadro 5600 graphics card (PNY model) from another machine and want to use it with my late 2007 Mac Pro since my ATI XT1900 is slowly dying, has some temperature issues.
I am only gonna use this machine for Windows and I am aware that the card won't work in MAC OS but I thought it should work just fine otherwise.
So I installed the card and connected a second PCI Express 6 pin power cable (in addition to the one that was there from my ATI card) from the mainboard (so from the unoccupied 6-pin connector next to the other one) to the card.
When I was switching on the machine, a buzzer sounds and apparently it means not enough power:
http://www3.pny.com/QuadroPDFs/5600PowerRequirements.pdf
so I thought there is something wrong with the mainboard 6-pin power connectors and used a molex y-adapter to directly connect the card to the power supply but with the same effect.
Next thing I tried to connect an external 200W power supply directly to the card, guessing that the MAC's power supply won't be enough (which it should...think 900W?) but still getting the buzzer sound.
Anyone tried this setup before or has some hints to how to resolve this issue?
If not, I guess I have to sell the card and look for an alternative - which card would be compatible for Windows use in my MAC Pro?
thank you all in advance,
Johannes Kohnle

I would concur, XP/Vista firmware reads two versions and most PC graphic cards have two versions embedded.
So hopefully with Mac's technical experience they should be able to do what Microsoft have been doing for years.
This is a well covered subject, we are all expecting something soon. Mr jobs told us so.
The reality is I guess, do Apple want to do it?
History dictates that they are not exactly ones for making Mac's upgradeable.
I too and I expect many others will seriously consider whether to upgrading again if the 8800GT for the Mac Pro 2006 /7 never materialises, mind you we could always place a pillow on it and use it as a seat.

2007 Mac Pro Graphics issues

Hey, I've got a 2007 Mac Pro, with the ATi X1900 XT, and since upgrading to Leopard, have had some odd graphics corruption and system hang ups.
While using any particular application, random horizontal lines will spontaneously appear across the particular application like so.
Safari:
http://img355.imageshack.us/img355/8757/picture1pr4.png
Evernote:
http://img355.imageshack.us/img355/3186/picture2ca9.png
I'm certain this is not a display related issue, since I can move the application, and the artifacts move with it. Hiding, closing, or scrolling up and down repeatedly are somewhat effective at removing the artifacts, but only temporarily.
In addition to that, square 'swatches' or blue, yellow, or pink spontaneously appear in isolated instances, although those disappear whenever I shift focus to another application, or activate Expose.
In addition, the computer will randomly freeze up when coming out of screen saver, or while using Expose or Spaces, although I am still able to move the mouse. I can still SSH into the computer as if it was fully functional, however, any attempts to 'unfreeze' the desktop are in vain.
This sounds vaguely similar to some issues with the Early 2008 Mac Pro with the nVidia card, however, I am unsure if there is any correlation between the two.
I'm running Leopard, with all available updates, and have applied to firmware update for the X1900 XT ( http://www.apple.com/support/downloads/atiradeonx1900xtfirmwareupdate.html ), although nothing has helped.
Anybody here ever experience anything similar to this, and / or have any advice on what to do?
Thanks in advance,
Noah

<Edited by Moderator>
I got a replacement for my 1900XT that is the newer version but even with keeping it dust free and using smcFanControl it still has issues after extended periods of use. I'm hoping the 8800GT that just came out for 1st gen MPs doesn't start giving people problems, because if not I plan to get one this summer.

Can Mac mini boot into 64-bit kernel

http://macperformanceguide.com/SnowLeopard-64bit.html says:
To determine if your Mac has 32-bit or 64-bit firmware, copy/paste the following command into Terminal:
ioreg -l -p IODeviceTree | grep firmware-abi
...output:
| | "firmware-abi" = <EFI64>
As shown above, the firmware-abi has the value EFI64, indicating that my Mac Pro is 64-bit capable. If it reads EFI32, then your Mac cannot be booted into a 64-bit kernel.
...well, my Mac mini displays that EFI64 64-bit info, but when booting with the "64" keys down it nevertheless uses the 32-bit kernel.
So can the Mac mini boot into 64-bit kernel?

What you are missing is that Apple has written into the boot ROM for certain Macs which meet the criteria to not be able to boot with the 64-bit kernel. The Mac mini is not allowed to boot into 64-bit mode by Apple. There is a list of non-pro Macs hard coded into the EFI boot firmware that tells it not to allow these Macs to boot into 64-bit mode. The Mac mini is on the list! Try as you may the Mac mini will not do it without a hack.
If you google this issue you can find a hack to rewrite the boot firmware and allow the mini to boot into 64-bit mode. It can be dangerous to your mini if you make a mistake!
Here is one hack;
http://www.osxbook.com/blog/2009/08/31/is-your-machine-good-enough-for-snow-leop ard-k64/
Dah•veed

If you format in Guid for Intel Macs, Apple partition for PPC Macs for Boot drives, then why do my PPC Hard drives Boot in my 2007 Mac Pro, what gives?

I recently purchased a 2007 Mac Pro for a song, swapped the CPU's for octo chipsets and proceeded to wait for new Hdd's in the mail. I was told the Hard drives in my old G5 would not be bootable unless they're in Guid format. Disc Utility confirmed to use the specific maps as well and yet all of my 2006 PPC Power Mac G5 Hard drives boot in my MP without a hitch, although a few none universal apps do not work. So what am I missing, does it really matter which Apple partion map to choose from or is this a fluke?...

all of my 2006 PPC Power Mac G5 Hard drives boot in my MP without a hitch
Yes, and what version of Mac OS are they booting?
>> They will boot the OS that is on them, but not a later one.

Late 2007 Macbook Pro: DVI to VGA Adapter

I lost my DVI to VGA Display Adapter for my late 2007 Macbook Pro and can only find adapters for the PowerBook G4. Will this adapter work for my Macbook Pro?
Thanks!

Yes, all of those DVI+A to SVGA/VGA adapters for Macs are the same. I have adapters from the titanium G4, aluminum G4 and intel MBP and they all have DVI and came with adapters that function the same.

A late 2007 Mac Pro (2,1) no longer boots into 64-bit Snow Leopard

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