Snow Leopard can't Install over 10.5.8

I have a macbook pro that currently has Max OS X operating system version 10.5.8 installed on it. This macbook pro is about 3 years old and has a 2.6 GHz Intel Core 2 Duo processor with memory of 4GB and plenty of space on the hard drive (about 86 GB). I put in my new snow leopard install disk (version 10.6.7) and when I start the install the opening screen says "Mac OS X Snow Leopard cannot be installed on this computer." However, I went online and believe that my computer fits all the specifications and it should be able to upgrade. Does anyone know why this may be happening? The model number of my macbook pro is MB134LL/A. Thanks for the help.

zander wrote:
is there anyway to restore the old macbook pro to factory settings as if it just came out of the box without having its original operating disk? Let me know. Thanks.
Basically, no. However if you ring the Apple Store number for your country and give them the serial number of your Mac they will send you replacement disks for a nominal fee. On the other hand, Snow Leopard isn't expensive, and as long as your Mac is correctly specified for it this would probably be a better bet. Be careful about application and printer compatibility, though - some printers ceased to be supported for Snow Leopard (HP are bad in this respect).

Similar Messages

Wiped my entire macbook drive and now snow leopard won't install over snow leopard server, HELP!

I ordered, what I thought, was Snow Leopard a while ago because I was running Leopard and I wanted to get the app store so I could move onto Lion and then Mountain Lion. I ordered the disc over the phone and the woman sent me the Snow Leopard Server instead of just Snow Leopard, I didn't think much about it so I clean installed it and ran it on my unibody macbook for a while. I didn't see much use for the disc anymore seeing that everything was downloadable at this point, so I sold the disc on Ebay and carried on. The server edition started to slow my computer down due to all of its excess applications and what not, and I read online that Lion and Mountain Lion are also very slow on the old unibody Macbooks so I ordered a regular Snow Leopard disc, now available online, and tried to install it. My computer said Snow Leopard cannot be installed over Snow Leopard server so I went to disc utitlity and wiped my entire drive while the OS X Snow Leopard disc was running and trying to install. I went back to the install window and it still said OS X Snow leopard cannot be installed over Snow Leopard Server so I shut down my computer and tried to turn it back on and I all I got was a blinking folder with a question mark in it, what do I do????????
P.S. All of my content is backed up on an external harddrive so I am all good with that.

Drive Preparation
1. Boot from your OS X Installer Disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Utilities menu.
2. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Note the SMART status of the drive in DU's status area. If it does not say "Verified" then the drive is failing or has failed and will need replacing. SMART info will not be reported on external drives. Otherwise, click on the Partition tab in the DU main window.
3. Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Click on the Options button, set the partition scheme to GUID then click on the OK button. Set the format type to Mac OS Extended (Journaled.) Click on the Partition button and wait until the process has completed.
4. Select the volume you just created (this is the sub-entry under the drive entry) from the left side list. Click on the Erase tab in the DU main window.
5. Set the format type to Mac OS Extended (Journaled.) Click on the Security button, check the button for Zero Data and click on OK to return to the Erase window.
6. Click on the Erase button. The format process can take up to several hours depending upon the drive size.
7. After formatting has finished quit DU and return to the installer. Complete the Snow Leopard installation.

Have early 2007 MacBookPro, Intel core 2 duo, 2.16 GHz; six mos ago expanded memory to 3GB to upgrade software to Snow Leopard; can I install Mountain Lion on my hardware?

have early 2007 MacBookPro, Intel core 2 duo, 2.16 GHz; six mos ago expanded memory to 3GB to upgrade software to Snow Leopard; can I install Mountain Lion on my hardware?

Supported
Models
iMac (Mid 2007 or newer)
MacBook (Late 2008 Aluminum, or Early 2009 or newer)
MacBook Pro (Mid/Late 2007 or newer)
Xserve (Early 2009)
MacBook Air (Late 2008 or newer)
Mac mini (Early 2009 or newer)
Mac Pro (Early 2008 or newer)

I still have snow leopard, can i switch over to mountain lion or i need to have lion first?

i still have snow leopard, can i switch over to mountain lion or i need to have lion first?

If your system meets the Mountain Lion specs, http://www.apple.com/osx/specs you can go directly to ML from Snow Leopard.

Snow Leopard - Can't install 9.0.2

After Effects crashes at start-up since i upgraded to Snow Leopard (did a clean install).
I am using After Effects from a new created account with no problems there, except that the upgrade to 9.0.2 fails each time.
Tried it from both user accounts, same result. Note that upgrading Acrobat 9 worked from the new account and failed with the "old" one.
Any suggestions?

I have tried the following, each time following the recommended procedure :
- do a clean install of 10.6.0 then upgrade t 10.6.2
- trash the preferences and reboot immediatly
- un-install CS4 & run CS4 cleanup utility
- delete all fonts flagged as duplicate in font book
- run font nuke
After Effects runs in a new created account. Not in my original account.
I also tried the following :
- install snow leopard & upgrade (clean install = clear the boot HDD)
- install CS4 master collection
No problems, can run all programs.
Started Migration Assistant : after a fe hours, while migration assistant was still active, problems show up again.
So there must be something wrong in my account, but can't find it. It doesn't seem to be fonts. There is a growing list of users of photoshop and illustrator reporting similar problems since upgrading to SL.

Boot Camp on Snow Leopard can't install Windows-Stuck on black BIOS screen

I'm running Snow Leopard 10.6.8 on an early 2008 Mac Pro (dual 3.2Ghz Harperton CPU's, 10gb RAM) with Boot Camp version 3.0.4 (all updated). I've successfully had a Boot Camp partition in the past, running WindowsXP32 Bit. I just purchased Windows7 Professional and can't install either the 32bit or 64 bit version. Neither can I install any of my original Windows disc. Boot Camp successfully creates the partion, then asks me to install the Windows install DVD/CD which I do, and then when it reboots, it gets stuck in a black BIOS screen that says "Initializing..."
I've tried all my Windows discs: WindowsXP-32bit, Vista-32Bit, Vista-64Bit, Windows7-32Bit, Windows7-64Bit. Same problem...gets hung on the black BIOS screen. I disconnected all my USB hardware except for my keyboard/mouse. All my other internal drives are disconnected.
The only thing that I can think of is that is different is my MacHD is a 500GB Seagate MomentusXT solid state hybrid drive.
Any help is greatly appreciated!!!!!!!
Thanks

Hi fellow Mac buddie,
I just zapped the PRAM, and also reset the SMC switch on the mother board.....no luck.
In refenece to the hybrid SSD drive, I've already taken that one out, put in a fresh 3.5" drive, formatted and installed a fresh clean version of Lion OS, and then attempted the Boot Camp install using Lion with the newest Boot Camp version (3.1 or 3.2) Please see my original post above.
Same issue, black BIOS screen.
Also tried Boot Camp Windows install on a second drive in drive bay 2 (an option now in Lion's Boot Camp)
same issue, black BIOS screen.
Lastly, I've tried all these interations using my three different Windows install disks (XP, Vista, Windows7).
XP is a "full install" disk, Vista and Windows7 are upgrade disks. But I've had XP installed previously using Boot Camp with no problem. So I'm confused I can't even install XP.
As another option, I went to a friend who has a PC, and I installed Windows 7 on a new hard drive. I'm about to install that in drive bay 2, reboot while holding down "option", and see if I can boot directly into that disk.
That's a workaround, as is VMWare Fusion which I have and Windows7 works fine as a virtual machine.
But when something doesn't work the way it's supposed to (in this case Boot Camp), it bugs me makes me want to know why it doesn't. I'll report back with regard to the 2nd bay Windows7 hard drive install.
SPY500

Unable to change to GUID partition scheme so Snow Leopard can be installed

Upgrading from OS 10.5.8 to Snow Leopard 10.6.3 on Macbook 4.1 with Intel Core 2 Duo, 2GB RAM. Instructions state "Macintosh HD" can't be used because it does not use the GUID partition Table Scheme. Use Disk Utility to change the partition scheme. Select the disk, use the Partition Tab, select the Volume Scheme, and then select Options.
Problem: The Options button is grayed out. The Partition Map Scheme is Apple Partition Map.
Note: Macbook purchased in 2008, but the hard drive was replaced in April 2011. Hard drive Information:
Name :
TOSHIBA MK1655GSXF Media
Type :
Disk
Partition Map Scheme :
Apple Partition Map
Disk Identifier :
disk0
Media Name :
TOSHIBA MK1655GSXF Media
Media Type :
Generic
Connection Bus :
Serial ATA 2
How do I change the partition scheme to GUID?

This requires that you repartition the entire drive as follows:
Drive Preparation
1. Boot from your OS X Installer Disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Utilities menu.
2. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Note the SMART status of the drive in DU's status area. If it does not say "Verified" then the drive is failing or has failed and will need replacing. SMART info will not be reported on external drives. Otherwise, click on the Partition tab in the DU main window.
3. Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Click on the Options button, set the partition scheme to GUID then click on the OK button. Set the format type to Mac OS Extended (Journaled.) Click on the Partition button and wait until the process has completed.
4. At this point you can quit DU and return to the installer and install Snow Leopard.
If you have data you wish to save then you need to backup before doing the above.

Final Cut Suite 1 and Snow Leapard - Can't install

Final Cut Suite 1 and Snow Leopard - Can't install
"Your computer doesn't have the required hardware to run this software, see Read Me for details."
I take a look at the 'Before You Install' file, since there is no 'read me' file and it's hardware requirements are basically ancient for what this computer has.
I assumed that Final Cut Suite 1 was simply too old for Snow Leapard, but my searches are not hitting in Goggle or here at the FCP Forums.
Any ideas would be great, thanks for your time!
-Monty

What is the Final Cut Pro version included in your Studio 1 suite?
If it is a 5.0.x version, then it is Power PC only. That version will install on an Intel based Mac but exhibit some odd quirks. In short, it was incompatible to start with.
A 5.1.x version should [at least in theory|http://snowleopard.wikidot.com>, work without problems.

Snow leopard can't be installed on my machine.

Alright, here goes. Thank you in advance.
BACK STORY:
I have an Intel iMac. I've had it for a few years and it's always been awesome. I was running Leopard, and it was all gravy. So much so, that I even took it in to my Apple store to see if there was anything I needed to do to protect my machine, or if there were any updates for my machine that I should purchase. Dude at genius bar said yea, there is an iLife update and a new version of OS, Snow Leopard. He told me he would update my macbook (which was getting a new hard drive put in) for me and show me how to do it, so that when I got home with my iMac, I could do the same update to it. iLife 11 and Snow Leopard installed perfectly on my Macbook (my secondary computer). I tried to installed Snow Leopard verbatim what the Apple associate showed me, with his written directions. Popped in my disc, selected English, install began, got about 1/3 of the way through the progress bar and an error message came up reading "Snow Leopard can't be installed on this machine". Interesting. Apple store guy said I was good to go?
DIAGNOSIS FROM APPLE STORE:
I took my iMac back to the apple store the next day, with my macbook incase I needed to run a firewire from iMac to Macbook to transfer files. Dude tried to save some of my data but couldn't access it. He told me there was a OS conflict and he was unable to archive and install. He gave me a card with all the information for a data recovery service and told me I was SOL. Great. I took my mac in to make sure it was good to update, he said yes, and then I did it, in turn frying my main computer into a useless paperweight.
FUNCTIONALITY:
When I try to turn on my iMac now, it goes to a grey screen with an apple and a spinning gear. This screen stays up for about 45 seconds and then the computer shuts off. I've connected a firewire to the iMac and my Macbook and held the T key down in an effort to save my photos and music etc. The firewire symbol comes up on the iMac, but nothing appears in my finder on my Macbook like an external hard drive would. If I put the Snow Leopard disc in, and hold the T key, the Snow Leopard disc will show up in my Macbook's finder/desktop. If I put the Snow Leopard disc in the iMac and boot it up the computer just shuts down, even if I hold the C key. If I boot with the Leopard disc and hold C, the disc will mount and I can re-install Leopard, but I get a warning that all of my data will be erased in doing so. Obviously I don't want to part with 200+ GB of data. My last back up was about a month before all this so it won't be the end of the world but there are photos and other things that are recent to my hard drive with no back up and that I'd rather not lose if I don't have to.
BASIC INFORMATION:
I'm 24 with a bachelors degree and I am very comfortable with my mac. AKA you don't have to reply like you're teaching your grandma how to email.
My iMac IS an Intel iMac.
I have 47 GB of free space on it, plenty of room for an OS update.
Firewire ports are FW400 on both computers.
I had to archive and install Leopard once about a year ago on my iMac. Not sure why there was issue, but the problem was fixed when I did this.
So, do I have any options here besides erasing my hard drive? Has anyone ran into this before. Sorry for the rant. Thank you again.

Attach an external hard drive to the iMac. Boot from the Snow Leopard disc again, launch Disk Utility, go into the Restore tab, select the internal drive as the source, select the external drive as the destination, and restore. Then partition -- do not merely erase -- the internal drive, and see whether you can install onto it. If you can, use Migration Assistant to restore your data from the backup.
Not backing up = inevitable data loss.

How do I partition my MacBook Pro so I can keep Snow Leopard and also install Mountain Lion?

How do I partition my MacBook Pro so I can keep Snow Leopard and also install Mountain Lion?
I want to install the latest OS, but I already know that I will lose a lot of my software unless I can partition the hard drive and have two "bootable" drives.
How do I retain everything I have, partition the drive, then reloa the software I own according to which OS it will work under?

msmedia wrote:
I do not currently own OS X ML.
I am currently running OS X (10.6.8 Snow Leopard) on my MacBook Pro. It has a 2.8GHz Intel Core 2 Duo Processor. I want to upgrade to Mountain Lion, but many of my software titles will not operate with ML and I cannot afford to replace some of them (Adobe Creative Suite, for e.g.)
After I back-up my HD and then partition the HD, how do I use the back-up to reinstall what I want to the SL partition, and then place the rest on the ML partition.
I have not done what you want to do, so can only offer some general thoughts in support. Take value from the following where you can. No guarantees.
If it was me, I would use a disk clone utility (e.g. Carbon Copy Cloner) to image the existing Snow Leopard disk to an external drive. Then verify that the external drive would boot and run Snow Leopard normally.
I would then purchase and download the Mountain Lion upgrade installer, but not run it. Use Lion Diskmaker to make a bootable USB stick, and perform a clean install of Mountain Lion, replacing the Snow Leopard on your MBP. This way, you make absolutely certain that no third-party drivers or other SL cruft remains to make Mountain Lion unstable. Update to latest ML point release. Fix permissions. Let TimeMachine make a full backup of your ML installation to a different external drive. Then turn of Time Machine.
In Disk Utility, use the + sign at the bottom of the ML partition to add another GUID, HFS+ Journaled partition for Snow Leopard. Resize to taste. Name it differently from your ML partition. Exhale.
Now ideally, you would like to reverse the external clone and put it back into the new SL partition. Then fix permissions. And demonstrate that you can boot into individually stable OS X installations. This would save you alot of work. Resist copying your home directory into ML just yet.
If you cannot successfully achieve the preceding paragraph, you will be faced with a full SL and application reinstall.
The ~/Library contents for SL and ML are sufficiently different that you do not want to mix them. You may want to salvage Safari bookmarks.plist. And, ML created folders in the home directory may have different permissions or ACL settings than in SL. So, my rule of thumb would be to copy folders that you created in SL, and only the contents of matching named OS created folders such as Music, Pictures, Downloads, etc.
For each operating system, you probably want the Time Machine settings to exclude the opposite OS X partition. If you use the same host name in Sharing prefs, then you will mix SL and ML backups on the same Time Machine back up drive. If you use different host names, they will be distinct folders in the Time Machine backups.backupdb and allow discrete restores per host. You may also want to gag Spotlight from indexing the opposite OS X partition.

I have a 2008 imac with snow leopard. i installed update 10.9.3 not realizing it's best for Maverick's users. Now my Itunes 11.2.2 won't burn playlists to CD.   Anyone else with this problem? CAn I uninstall the 10.9.3 update?

i have a 2008 imac with snow leopard. i installed update 10.9.3 not realizing it's best for Maverick's users. Now my Itunes 11.2.2 won't burn playlists to CD.   Anyone else with this problem? CAn I uninstall the 10.9.3 update? Also my HP scannerwill not save the displayed scanned document since this update! it just saves gray.

If you have your old system backed up then erase the drive and restore your backup. If you don't have a backup then backup your entire Home folder. Erase the drive and install Snow Leopard after which you can restore your Home folder from the backup.
Clean Install of Snow Leopard
Be sure to make a backup first because the following procedure will erase
the drive and everything on it.
     1. Boot the computer using the Snow Leopard Installer Disc or the Disc 1 that came
         with your computer. Insert the disc into the optical drive and restart the computer.
         After the chime press and hold down the "C" key. Release the key when you see
         a small spinning gear appear below the dark gray Apple logo.
     2. After the installer loads select your language and click on the Continue
         button. When the menu bar appears select Disk Utility from the Utilities menu.
         After DU loads select the hard drive entry from the left side list (mfgr.'s ID and drive
         size.) Click on the Partition tab in the DU main window. Set the number of
         partitions to one (1) from the Partitions drop down menu, click on Options button
         and select GUID, click on OK, then set the format type to MacOS Extended
         (Journaled, if supported), then click on the Apply button.
     3. When the formatting has completed quit DU and return to the installer. Proceed
         with the OS X installation and follow the directions included with the installer.
     4. When the installation has completed your computer will Restart into the Setup
         Assistant. Be sure you configure your initial admin account with the exact same
         username and password that you used on your old drive. After you finish Setup
         Assistant will complete the installation after which you will be running a fresh
         install of OS X. You can now begin the update process by opening Software
         Update and installing all recommended updates to bring your installation current.
Download and install Mac OS X 10.6.8 Update Combo v1.1.
Or you can:
Try these in order testing your system after each to see if it's back to normal:
1. a. Resetting your Mac's PRAM and NVRAM
    b. Intel-based Macs: Resetting the System Management Controller (SMC)
2. Restart the computer in Safe Mode, then restart again, normally. If this doesn't help, then:
     Boot to the Recovery HD: Restart the computer and after the chime press and hold down the
     COMMAND and R keys until the Utilities 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.
3. Repair the Hard Drive and Permissions: Upon startup select Disk Utility from the Utilities menu. Repair the Hard Drive and Permissions as follows.
When the recovery menu appears select Disk Utility. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the main menu. Select Restart from the Apple menu.
     Reinstall the 10.9.3 update: OS X Mavericks 10.9.3 Update (Combo).
4. Reinstall Lion/Mountain Lion, Mavericks: Reboot from the Recovery HD. Select Reinstall Lion/Mountain Lion, Mavericks from the Utilities menu, and click on the Continue button.
Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.
Reinstall the 10.9.3 update: OS X Mavericks 10.9.3 Update (Combo).

I want to install an old airport express, the ones which are directly plugged into the socket - but it does not work with Maverick or Snow Leopard - can I configure it with a windows pc?

I want to install an old airport express, the ones which are directly plugged into the socket - but it does not work with Maverick or Snow Leopard - can I configure it with a windows pc?

The Mac running Snow Leopard should be able to configure virtually any version of the AirPort Express.
Tell us what steps that you are taking to configure the Express and what happens after each step.

If you lost your install CD's for an iMac7,1. Can you use Snow Leopard to reboot/install?

If you lost your install CD's for an iMac7,1. Can you use Snow Leopard to reboot/install?

Best answer; see AnaMusic above.
Will SL do? Yes, provided you use the SL retail disc. A grey disc from another Mac will not work.
A few considerations -
Be warned that printer drivers, and scanner drivers in particular will almost certainly need updating for SL. That could be a problem if the printer or scanner is more than a couple of years old.
Many third party applications (and some Apple ones) may need updates for SL (Adobe particularly), so check with the vendors for compatability before you upgrade.
You'll need Rosetta to run PPC apps like Appleworks and many MS Office or Adobe versions. Ensure you select it from the 'optional installations' when installing SL.
Note also that any bundled applications that came with your Tiger original discs (iLife in particular) are not included on retail OS versions.

Can I purchase the OS X 10.6 Snow Leopard version but install the 10.5 Leopard

Can I purchase the OS X 10.6 Snow Leopard version but install the 10.5 Leopard instead?

*Mac OS X 10.5 Leopard installation system requirements*
http://support.apple.com/kb/TA24950
Leopard is no longer available at the Apple Store *but may be available by calling Apple Phone Sales @ 1-800-MY-APPLE (1-800-692-7753)*.
Installing Mac OS X 10.5 Leopard
http://support.apple.com/kb/HT1544
Mac OS X 10.5 Leopard Installation and Setup Guide
http://manuals.info.apple.com/en/leopard_install-setup.pdf
After you install the base 10.5, download & install the 10.5.8 combo update at http://support.apple.com/downloads/Mac_OS_X_10_5_8_Combo_Update
 Cheers, Tom

I have a desktop Mac OS X Leopard. I want to upgrade to Quicken 2007, Install Snow Leopard and download iLife '11. I heard that Quicken and Snow Leopard can clash and have problems. What would be the best order for installing these products. Thank You.

I have a desktop MAC OSX Leopard. I want to upgrade to Quicken 2007, install Snow Leopard, download iLife'11. I heard that Quicken and Snow Leopard can clash..........that is why I am upgrading Quicken. What would be the best order of installing these products. I have gotten defferent opinions and I want to be sure I install them correctly.
Thank You.

First, install OS X, then install your third-party software.
How to Install OS X Updates Successfully
A. Repair the Hard Drive and Permissions:
Boot from your current OS X Installer disc. After the installer loads select your language and click on the Continue button. Then select Disk Utility from the Utilities menu. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the installer. Now restart normally.
If DU reports errors it cannot fix, then you will need Disk Warrior (4.0 for Tiger) and/or TechTool Pro (4.5.2 for Tiger) to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.
B. Make a Bootable Backup Using Restore Option of Disk Utility:
1. Open Disk Utility from the Utilities folder.
2. Select the destination volume from the left side list.
3. Click on the Restore tab in the DU main window.
4. Check the box labeled Erase destination.
5. Select the destination volume from the left side list and drag it to the
      Destination entry field.
6. Select the source volume from the left side list and drag it to the
      Source entry field.
7. Double-check you got it right, then click on the Restore button.
Destination means the external backup drive. Source means the internal
startup drive.
C. Important: Please read before installing:
1. If you have a FireWire hard drive connected, disconnect it before installing the
      update unless you will boot from this drive and install the update on it.
      Reconnect it and turn it back on after installation is complete and you've
      restarted.
2. You may experience unexpected results if you have installed third-party system
       software modifications, or if you have modified the operating system through
       other means. (This does not apply to normal application software installation.)
3. The installation process should not be interrupted. If a power outage or other
      interruption occurs during installation, use the standalone installer (see below)
      from Apple Downloads to update. While the installation is in progress do not use
      the computer.
D. To upgrade:
Purchase the Snow Leopard Retail DVD.
Boot From The OS X Installer Disc:
      1. Insert OS X Installer Disc into the optical drive.
      2. Restart the computer.
      3. Immediately after the chime press and hold down the "C" key.
      4. Release the key when the spinning gear below the dark gray Apple
          logo appears.
      5. Wait for installer to finish loading.
      6. Follow instructions.
After installing Snow Leopard you should update it by downloading and installing Mac OS X 10.6.8 Update Combo v1.1.

Snow Leopard can't Install over 10.5.8

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