MacPro3,1 won't boot into Snow Leopard 64-bit mode

I'm baffled by this. All the compatibility lists I've found online state the MacPro3,1 (early 2008) models are 64-bit compatible.
I have a 3,1 mac pro, single 4-core Xeon, 8GB RAM at work, and it boots into 64-bit mode just fine.
I have the exact same machine at home, except just 4GB RAM, and it will not boot into 64-bit mode.
I have not found any documentation on this, but my only hunch at this point is that not only does 64-bit mode enable more than 4GB of addressable RAM, but could it be that it requires more than 4GB?

OK, I got it. added "arch=x86_64" to com.apple.boot.plist and it is now booting into 64-bit mode. Its just strange that holding down 6 and 4 during boot didn't work on this machine, when it worked fine at the office.
Hope this helps somebody.

Similar Messages

MacBook Pro won't boot into Snow Leopard

Hello all,
I've been running Snow Leopard for a few weeks now with no problem, but today my laptop refuses to boot into the Snow Lepoard partition, it is stuck on a grey screen with the logo and a spinning wheel.
I have tried booting into safe mode with no luck. Also I have a Windows boot camp partition which I can boot to and work properly, and finally I have booted from the Snow Leopard disk and run disk utility, the HDD can be verified and the only warnings I get when repairing permissions are about SUID files being modified and will not be repaired. I don't know if that s the root of my problems, any advise will be greatly appreachiated (sp?).
Thanks

Thanks for the help, but I would like to know what went wrong and how to avoid this in the future.
I've usually found that such problems are accompanied by hard drive damage, but you say it's testing fine, so that's obviously not it. But sometimes vital files get corrupted somehow and you never know why, unfortunately. It could have its roots in some application crashing a year ago.

I have a MacBook Pro 15" and my warranty just ran out! I partitioned my harddrive into two partitions, one with Snow Leopard and the other with microsoft.This morning I turned on my Macbook Pro and it will not boot into Snow Leopard.

Good Morning,
I have a MacBook Pro 15" and my warranty just ran out! I partitioned my harddrive into two partitions, one with Snow Leopard and the other with microsoft.This morning I turned on my Macbook Pro and it will not boot into Snow Leopard. I shut it off took out the battery, reinstalled the battery. Then I put in the Snow Leopard CD and booted up to disk utility and The Snow Leopard partion would not show up?? I do see the microsoft partion.
I also rebooted holding down the shift key and still no Snow Leopard
Could you please tell me what I can do, what keys do I press on restart any advice to get Snow leopard back.
thank you.

Have you restarted holding down the Opt key? That procedure should give you a gray screen with all of the partitions that exist. Then select the SL partition for boot. Also go to System Preferences and Startup Disk, unlock the lock and select the SL partition as the default boot partition, then relock.

The Tale of the Beeping Macbook - AKA- My Macbook Pro keeps beeping when trying to boot into Snow Leopard Disc's disk utility

Quick back story: about a month ago my macbook was falling and I caught it quickly, I had a game controller in my hand and it lightly hit it whilst I was catching it; the laptop made no contact with the floor, couch etc. Upon reveling in my epic matrix esque catch I noticed it was beeping and the screen was completely black - Horrified I held down the power button for a forced power down and then turned it back on to see that it was fine, along with no visible scars, dents etc to the chassis. Now flash forward to present day, and the macbook pro is only two months old (bought may 4th 2011) and I notice it's got some slightly irregular slow loading points when loading a browser, photoshop, etc. I do the standard disk utility to verify the disc and it says
"Checking volume bitmap.
Checking volume information.
Invalid volume file count
(It should be 537095 instead of 537096)
Invalid volume directory count
(It should be 161641 instead of 161640)
The volume Macintosh HD was found corrupt and needs to be repaired.
Error: This disk needs to be repaired. Start up your computer with another disk (such as your Mac OS X installation disc), and then use Disk Utility to repair this disk."
So I put in the snow leopard disc to go to the disk utility within, reboot the laptop, and it goes to the gray boot screen with the dark gray apple logo and stays there whilst doing the aforementioned beep from my spider-sense catch. Does anyone happen to know what is wrong? Would that tiny tap from my controller when catching it have caused this problem I have now? Is there anything I can do at home to fix this since I can't get to the disk utility on the snow leopard disk? Will Batman ever get out of the Joker's trap? Or am I better off just making a genius bar appointment? Thanks in advance.
-ZRS

Are you using the Snow Leopard disc that came with that Mac? A gray disc that came with a different Mac won't boot yours, and a Retail (white) disc with a version of OSX earlier than the one your Mac came with won't boot it, either.
If you don't have the right disc, do you have an external HD, or can you borrow one?
(By the way, your post shows you're running Tiger; you might want to update that.)

MacBook won't boot after Snow Leopard Updatel

I installed the 10.6.3 update today and after the "installation complete" message and subsequent restart, my computer would load the gray screen. That's where the normal boot up would end. It would then switch to the blue loading screen followed by the Nebula login screen. But then it would loop between those two screens every 20 seconds or so. Occasionally on the nebula screen the login box would appear but if I tried to type or click anything I'd get the dreaded spinning beachball of death followed by a flicker and a return to the blue screen. Is anyone else experiencing this? I've tried booting into safe mode which does nothing. I booted from the disc and "repaired" the disc with no luck. Is here any fix I can do without having to erase and reinstall snow leopard?

Try downloading the "conbo" update and running that. If that does not work, run your install DVD without erasing the drive. That should do an automatic A&I and get you going again.
Dave M.
MacOSG v.2.0 coming April 1, 2010! No fooling! Check it out!
 MacOSG: An Apple User Group  iTunes: MacOSG Podcast  Follow us on Twitter: MacOSG

IMac won't boot unless snow leopard disc is in the drive

I am running 10.6.4 and have a boot camp partition running windows 7. The windows side is working fine, however snow leopard will not boot unless I put the disc in the drive. I don't need to do anything else at all, just put the disc in. If I do not put the disc in, I get the apple logo appear, a time bar appears at the bottom of the screen which fills up a small amount and then disappears and then I get the grey spinning circle and the apple logo for ever more!
Can anyone please offer me some advice?

Something you could try would be booting to the Snow Leopard install disk. Once at the welcome screen, choose your language and click next. At the top of the screen you will notice the menu bar appear, choose Utilities > Disk Utility. In Disk Utility choose your Mac partition, from there go to the First Aid tab and Verify the Disk and also your Disk Permissions. If any errors show up click Repair on the respective option. After that try booting to OS X again, without the Snow Leopard disk inserted.

Windows Vista won't boot in Snow Leopard

Hi everyone
I tried to boot into my Windows Vista Boot Camp partition today and it wouldn't start. After holding down the option key like usual, it just sat there with a white screen. No Apple logo. No partitions to click on like usual. Then my Mac ran incredibly slow and was glitchy. What happened to Windows? Please help.
All responses welcome and appreciated.
Thanks.
macdiscuss

You're very welcome.
I always leave the boot order BIOS setting to boot from the HDD first so as to shave off a few microseconds from the boot time.
When I need to boot from another device such as a DVD in your case, I turn on the PC, at the beginning of the HP welcome screen, I tap the F9 key to get the one-time boot menu.
I select the DVD drive from the list. Then I hit the button on the drive to open the drive, pop the bootable DVD in, close the tray, wait a second or so and then hit the enter key.
After I hit the enter key, watch the sreen for a message that states in substance...attempting to boot from DVD...press any key to boot from DVD...
I press any key and the PC boots from the DVD and off I go...
Looking forward to hearing back from you.
Now remember...making that file is pretty easy, but only if you read both my notes and the guy that wrote the procedure's steps carefully.
There have been a few forum members that I have had to coach during the process, because they were following that guy's every step to the letter, and as I pointed out, there is only one mistake on his first screen shot...but that one mistake is all it takes to stop you cold.
Disregard the part of the text under the first screen shot about "extract the files to the Vista folder."
The files were already extracted to that Vista folder when you ran the X14.exe file by reading the text on top of the first screen shot.
You get past that, and you're home free.
Good luck!

Won't boot from Snow Leopard USB Thumb drive

I have a 2.4 ghz Quad Core Mac Pro with 14 GB of memory... I have created two thumb drives, one is a bootable image of the installation disk for 10.6.. the other has the 10.6 installed..
The start up menu recognizes them both and says i can start from either but when I try I get no further the the Grey Start Up Apple.... any suggestions would be apprecoated

They are both GUID but since they were from an Snow Leopard Install Disk.. I believe tey are at 10.6.3
I will try upodating the Drive with the full system.. but if that is the case then I am sort of uo thw water way with oiut a propulsion device for the Install Disk version

OS X Lion 10.8.2 won't boot into recovery mode

Help! OS X Lion 10.8.2 won't boot into recovery mode, I get a grey screen, the apple icon and the spinning symbol...Does anyone have any suggestions?
Have a MacBook Pro (2009) and had no problems until upgrading to LIon from Snow Leopard... thanks!

Hi there - thanks very much for your suggestion, it did reboot eventually but took a long time to get there.
I've have run Disk Utility. After Verifying the disk it said it needed Repairing - so tried doing that and got the message " Error: Utility can't repair this disk. Back up as many of your files as possible, reformat the disk, and restore your backed-up files" I have got Time Machine but haven't backed-up since Dec 12...Can I use "Restore" to copy the MBP HD to an external HD and then re-install Lion?

Can't Boot from Snow Leopard Partition

I have a Macbook Pro from 2008. It previously just had one partition, with Lion on it.
I created a new partition for Snow Leopard
I installed Snow leopard from a retail disk on the second partition. The installation went fine, and I got the message at the end that the installation was successful, and to restart the computer.
When I restart it, it just goes to the gray Apple screen, with the spinning gear, and never gets farther than that. The gear is spinning.
I can still boot successfully into Lion. Once I booted into Lion, I chose the Snow Leopard partition as the Startup Disk, but the same thing happens - just the gray Apple screen and spinning gear. I've let the machine sit for half an hour in that state, but it still does nothing but the spinning gear.
Any ideas on why I can't boot successfully into Snow Leopard and how I can fix it?
Thanks.

I already knew that I'm free to follow my own course, but thanks for giving me your permission (???)
And would knowing the original OS of the machine make any difference in your "advice"? If it was originally Leopard, would that make it any different than if it was Tiger? Answer: No, because you don't understand the problem, and you don't know how to fix it.
Thanks.
If anyone ACTUALLY KNOWS anything about this problem, please post, as many others will benefit.
If you DON'T ACTUALLY KNOW anything about the problem, either DON'T POST HERE, or else qualify your information to indicate that you are guessing. I'm open to suggestions and speculation, but could you please CHECK YOUR EGO AT THE DOOR, and tell people that you are GUESSING what the problem might be. You don't need to act like you are some great authority and try to make your random guesswork look like an established fact.
If you were walking in New York City, and you ask someone how to get to Carnegie Hall, but the person doesn't even know where Carnegie Hall is, would you rather:
1) Have the person tell you a bunch of random wrong information that could cause you wander aimlessly for hours?
OR
2) Have the person politely tell you they don't know where Carnegie Hall is, and that you should ask someone else?
IF YOU DON'T KNOW THE ANSWER, THEN DON'T ANSWER.
OR IF YOU ARE GUESSING OR MAKING A SUGGESTION, THEN QUALIFY YOUR STATEMENTS SO PEOPLE KNOW YOUR LEVEL OF UNDERSTANDING.
YOU DON'T HELP BY GIVING WRONG INFORMATION. YOU DON'T HELP BY STATING YOUR GUESSWORK AS A FACT.
Why do people not have the slightest amount of common sense here? Are you getting paid to just post random wrong info here or something?

Can I reboot my new iMac running OS 10.7 into Snow Leopard 10.6.8 from an external hard drive

I have installed my hard drive from a previous but terminally I'll iMac that was running Snow Leopard into a Sata to USB enclosure. This is displaying on the desktop of my new iMac running Lion as an external Hard drive,also system preferences sees it as a start up source.My question is , is it safe to restart into Snow leopard without causing a kernel panic and if it does boot will it be fast enough to use as it as a USB drive.I know I could try it and see, but I would rather some advice.
Regards
John Lewis

Yes you should be able to (as long as your computer didn't ship with lion, if so idk it would prob work though) although be aware it will be MUCH slower than the normal OS. Hope this helps!

My iMac will not boot through Snow Leopard but will boot through Windows OS

My 2010 iMac will not boot in Snow Leopard, only Windows. Have tried reinstalling Snow leopard a few times and works only for a couple of minutes before freezing and doesnt reboot. Windows works perfect. Snow leopard just doesnt want to boot up past the Apple Logo. It was working fine one day and the next day it froze up and was able to reboot back into Snow Leopard but kept freezing. Now it doesnt load at all into Mac OS.
Brian

Possible scenarios:
1: The 10.6.3 SL retail disk is bad, it happens.
2: Your not using the 10.6.3 SL retail disk but one from another machine which doesn't have the drivers for that machine.
3: Your optical drive is funky or some other hardware issues.
4: Your trying to install 10.6 onto a PowerPC based Mac, no can do.
5: Your not using a wired keyboard for boot key commands, have some other hardware conflicts.
Possible solutions.
1: Copy the SL 10.6.3 disk using Disk Utility to another DVD, the error checking may resolve the original disk's issue.
http://www.brokenhomeboy.co.uk/pierow/blog/2011/10/make-a-bootable-backup-snow-l eopard-install-disc/
2: Make a SL bootable USB
http://www.maciverse.com/install-os-x-snow-leopard-from-usb-flash-drive.html
3: Call Apple for a new 10.6.3 disk (and make copies for backup before Apple discontinues selling it)
If your upgrading to 10.6 to get to 10.6.8 to upgrade to 10.7, be warned of this:
1: Your 10.5 software will not work in 10.7, no more Rosetta or PPC based code.
2: Your hardware will not qualify if it's a 32 bit Intel Core Duo, also you may experience slowdowns in performance over 10.6 (10.6 is the fastest OS X version for Intel Macs) in older Intel hardware (I suggest Early 2011 Mac's and later only for Lion)
3: Mountain Lion 10.8 is reportingly coming out this summer and will not run on a lot of older Intel based Mac's because of heftier graphics requirements.
4: 10.6 has the widest range of current avaialble software and drivers for third party hardware.
My advice, stick with 10.6.8 and stay there, buy a new Mountain Lion machine after this summer. Skip Lion completely.

Dual Boot with Snow Leopard and Mavericks not possible?

I have a Early 2011 Macbook Pro with 2,3 GHz i7 Quad and two 512 GB SSDs (the secondary disk in an optical drive bay enclosure). This Macbook Pro can run Snow Leopard and Mavericks on the primary disk without problems. When I try to set up a dual boot system however, problems appear and it looks like it is not possible. When I start from Snow Leopard, I cannot select Mavericks as a start volume and vice versa. The error message says something like "Bless tool" cannot use this disk, i.e. unmount and boot from it. The problem remains when I exchange the disks (putting the primary disk in the drive enclosure and vice versa). When I put the secondary drive in an external case however, it is possible to boot from it - but strange things happen when the system starts: My computer clock is reset to 1/1/2001, WiFI passwords are not remembered for more than one session, disk permissions are reported as "repaired" but do apear as not repaired when I check them again - and other issues). I have verified both disks already and repaired permissions but that does not change the situation. So my experience is different from what is said in https://discussions.apple.com/thread/566781. It looks like the latest Mavericks cannot coexist with Snow Leopard on neiter a secondary internal drive nor on an external drive. This is strange since both disks and systems work flawless when run alone. Any suggestions to solve this problem?

When I check the Mavericks disk in the optical drive with disk utility after booting / running Snow Leopard on the primary disk I get som errors, see below ("disk utility Info"). So after all, I decided to erase the disk and install Mavericks new. But even erasing the disk is not possible when it is in the optical drive enclosure. I get this error message:
"Volume Erase failed with the error:
Could not unmount disk"
When I put this disk into an external case connected via USB however, it starts and runds MAvericks without any Problem. Same happens when I put thie Mavericks disk into the internal primary hard disk place.
"disk utility Info" when verinfying the secondary drive in the oprical bay:
Verifying volume “Samsung SSD Daten”
Performing live verification.
Checking Journaled HFS Plus volume.
Checking extents overflow file.
Unused node is not erased (node = 40)
Checking catalog file.
Unused node is not erased (node = 30)
Checking multi-linked files.
Checking catalog hierarchy.
Checking extended attributes file.
Unused node is not erased (node = 8)
Checking volume bitmap.
Volume bitmap needs minor repair for orphaned blocks
Checking volume information.
The volume Samsung SSD Daten was found corrupt and needs to be repaired.
Error: This disk needs to be repaired. Click Repair Disk.
Verify and Repair volume “Samsung SSD Daten”
Error: Could not unmount disk

Fastest mini to dual-boot Lion & Snow Leopard?

I do software testing and currently have an iMac set up so I can boot either Snow Leopard or Lion. For space reasons, I'd like to get rid of the iMac and get a mini instead, but it looks like the current models won't boot Snow Leopard (true??).
So what's the fastest older model that would serve my purposes. Or should I just forget about it?
Thx

Find a mid-2011 model that was delivered with Snow Leopard. You might be able to find one in the Apple refurbished systems on the Apple store web site, or possibly via an online retailer that still has stock.

Replaced faulty hard drive now can't boot from Snow Leopard.

Hi there,
As it says I replaced my internal WD 250gb drive in my late 2006 2.16ghz imac . I followed the tutorials on the net to the tee yet upon trying to boot from Snow Leopard after firing it back up all I get is the Apple logo and the timer . I've tried holding C to no avail . I've held Alt to select the OSX disc yet it still won't boot to get me to Disc Utility . I've even put the old hard drive back in . When I hold Alt on start up it shows the drive and the disc but will boot from neither when selected . I've tried to get the Snow Leopard disc to eject so I can try my originals but it won't even do that . I'm convinced I haven't damaged anything but I'm at my wits end ! Does anybody have any ideas how to get the Leopard disc out so I can at least try from my originals ? The drive I've installed is compatible it's a 1tb WD . I also triple checked all the connections and they all seam sound . Really appreciate your help lads as I wanted to give the iMac to my daughter when we get a new one .

You will first need to prep the new drive using Disk Utility on the original 10.4 Disc or Retail upgrade 10.6 DVD. It needs to be Partition GUID Partition Table and Format it Mac OS Extented (Journaled) before you can install and run OS X on it.
1. Boot from your SL install DVD or Bootable Clone and open Disk Utility.
2. Highlight the new HD in the list of drives and select the Partition tab.
3. Under Volume Scheme select 1 Partition and click on the Options... button.
4. Select GUID Partition Table in the drop down window and click OK.
5. Set the Format to Mac OS Extended (Journaled) and click the Apply button.
6. Once thats done, then you can do a clean Install, Restore from TM or a Bootable Clone.

MacPro3,1 won't boot into Snow Leopard 64-bit mode

Similar Messages

Maybe you are looking for