OS X v10.9.3 is already installed on this computer. Use the Updates page to install the 10.9 update or if you would like to download the full OS X installer click Continue."

I signed into Itunes and as part of my Downloaded list I saw that OS X was not downloaded back from October 2013. When I clicked to download this was the message. Should I Continue to Download or is OS X v10.9.3 the most current and/or sufficient? I'm obviously a bit confused. A little help with this would be great
Thank You,
Julesinthesky

Mac OS X 10.9.3 is the latest released version of the Mavericks operating system.
You can see what you have installed by clicking the apple, left-side of the menu bar, About This Mac and you will see below the Apple logo the installed version of the operating system.
If it is not 10.9.3 and you want to update to that version, then continue with the download and install.
Or, you can simply click Software Update (below About This Mac) and the system will do that for you.

Similar Messages

Use the Updates page to install the 10.9 update or if you would like to download the full OS X installer click Continue.

When I downloaded the OX I still have in the apple store on the OS X "download" When I click again on it I receive the following message : OS X v10.9 is already installed on this computer. Use the Updates page to install the 10.9 update or if you would like to download the full OS X installer click Continue. What does it mean "full" OS X installer?I downloaded already three times the same.

Mac OS X 10.9.3 is the latest released version of the Mavericks operating system.
You can see what you have installed by clicking the apple, left-side of the menu bar, About This Mac and you will see below the Apple logo the installed version of the operating system.
If it is not 10.9.3 and you want to update to that version, then continue with the download and install.
Or, you can simply click Software Update (below About This Mac) and the system will do that for you.

What did I do wrong? I used to have iTunes installed on this computer and lost it when it crashed. No I can't get past a certain point in the installation point. I keep getting an error message stating that I need to verify that I have access to this file

Help!! What's going wrong here. I used to have iTunes installed on this computer but lost it when it crashed. I've tried re-installing it numerous times but I keep getting the same error message. "Error writing to file: C:\ProgramFiles\iTunes.Resources\es.lproj\iPadLicense.rtf. Verify that you have access to that directory." I know I have access to that directory because on a different computer I can sync my iPad and iPhone. What am I doing wrong? What do I need to go in and authorize or turn on? Any help greatly appreciated. Thank you.

That one's consistent with disk/file damage. The first thing I'd try with that is running a disk check (chkdsk) over your C drive.
XP instructions in the following document: How to perform disk error checking in Windows XP
Vista instructions in the following document: Check your hard disk for errors
Windows 7 instructions in the following document: How to use CHKDSK (Check Disk)
Select both Automatically fix file system errors and Scan for and attempt recovery of bad sectors, or use chkdsk /r (depending on which way you decide to go about doing this). You'll almost certainly have to schedule the chkdsk to run on startup. The scan should take quite a while ... if it quits after a few minutes or seconds, something's interfering with the scan.
Does the chkdsk find/repair any damage? If so, can you get an install to go through properly afterwards?

"Mac OS X cannot be installed on this computer" used upgrade DVD up-to-date

I'm using an OS X 10.5 Leopard "Upgrade DVD" I bought with the up-to-date program when I bought a 2007 Macbook Pro (3,1) with Tiger bundled.
I tried to use it on my PowerBook G4 500 MHz (PowerBook 3,2), but it gave me the message:
"Mac OS X cannot be installed on this computer"
My upgrade DVD looks like the retail version (aside from the "upgrade DVD" text), and it doesn't have any text explicitly suggesting that it's a restore DVD for any specific model. Can I still assume this is effectively a retail DVD?

Came with 2007 Macbook Pro (3,1) implies that it can't be use with PowerBook G4 500 MHz (PowerBook 3,2). That violates the terms of use. Additionally, it's machine-specific, as described in http://support.apple.com/kb/HT2681 If you want to put Leopard on the PB, buy the retail version.

I am trying to update FCPX to latest version and I get message: FCP already installed on this computer use software update

I have FCPX on my desktop and laptop. Both OSX ver 10.6. My desktop is a Mac Pro, Laptop is a Mac Book Pro early 2009. I was able to update my installation on the laptop but when I tried to update the Mac Pro I got a message stating that the program is installed and I should use software update. Both computers still have FC Studio installed. Any idea why I am getting this message on my Mac Pro?

Make sure it's
OS X v10.6.8 or OS X v10.7.5 or OS X v10.8.3 or later.
and if it is you can delete the Final Cut Pro X application from your Applications folder. Then go to Purchases in the Mac App Store and download- it will be the latest version.

I would like to download the app "Jeopardy" to my HP laptop. I already have I itunes on my laptop

I have a HP laptop and I would like to get the app Jeopardy. It seems i need an Apple device, is that true?

Apps from the iTunes store only run on iOS devices.

Mac OS X can't be installed on this computer snow leopard

I just bought a new iMac and want to give my old iMac to my sister. It was bought during the leopard days and I upgraded it to Snow Leopard. I started up my iMac and went into Disk Utilities. I verified and repaired disk permissions. Then I went to verify Disk. This is where all the problems occured. It stops verifying and a pop-up says "Disk Utility sopped verifying "Macintosh HD" "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 find the only Snow Leopard disk I have, which happens to be the one from my wife's MacBook Pro, I put in and hold down the "C" key until I get to the installer. I use English as my language, then another pop-up states the Mac OS X can't installed on this computer, I can either restart or install from a back "Time Machine". I didn't want to install, I just wanted to get to the Disk Utilities feature, but it is greyed out, along with everything else.
So here I sit lost on what to do next. Do I reinstall from Time Machine, or do I need to find the original Snow Leopard that I bought for my iMac?
Any Answers to this would be great.
Thanks.

t-tech wrote:
I just bought a new iMac
New Mac's come with Lion and no boot disks, but a hold command r boot recovery partition.
t-tech wrote:
"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.
Silly Apple needs to fix that.
t-tech wrote:
So I find the only Snow Leopard disk I have, which happens to be the one from my wife's MacBook Pro, I put in and hold down the "C" key until I get to the installer. I use English as my language, then another pop-up states the Mac OS X can't installed on this computer, I can either restart or install from a back "Time Machine". I didn't want to install, I just wanted to get to the Disk Utilities feature, but it is greyed out, along with everything else.
Grey disks are machine model specific, surprised it gave you the limited options it did.
Don't use that disk for anything except the machine intended for it.
t-tech wrote:
So here I sit lost on what to do next. Do I reinstall from Time Machine, or do I need to find the original Snow Leopard that I bought for my iMac?
Depends upon the opertaing system your now using.
You say you "just bought a new iMac" that means like in the last week and Lion has been out for months now.
So first check under the Apple menu, Snow Leopard is 10.6.x and Lion is 10.7
If you have Snow, you need to order replacement disks from Apple with your serial number (apple menu > about this mac >get more info)
If you have Lion you need to learn some new things.
If it's 10.7 then it's Lion and it doesn't come with disks, a recovery partition that requires a strong reliable fast internet connection to download and reinstall Lion, but it has Disk Utility and can repair your Lion OS partiition, however if the problem is more serious then you need to try to make a Lion Recovery USB and boot from that to reinstall both Lion and the Recovery Partition.
You can thank Apple for adding another layer of complexity in their quest to remove the optical drives
Please make sure to have your data on a storage drive in addition to TimeMachine so you can do what you need, move the data to another machine.
Good luck with your studies.
https://support.apple.com/kb/HT4718
https://support.apple.com/kb/dl1433
https://discussions.apple.com/message/16276201#16276201

A later version of Apple Application Support is already installed on this computer.

I am trying to update / install iTunes 12.0.1.26. Apple Application Support will not install because it says there is already a later version installed. There is not! I have uninstalled after initial message and tried to reinstall but I still recieve the same message.

Good Afternoon, JohnHT2!
I think I have the fix to your issue.
I've been experiencing the same issue as you describe above. The issue occurred for me during the upgrade process from version 11.4.0.18 to version 12.0.1.26 (which is the current version downloadable from Apple). The installation sometimes appears to be okay, but the Apple Application Support fails to update correctly. In other instances, the iTunes installation fails completely with error 1603 (which is generic "fatal error" code).
Symptoms:
Just some of the symptoms I've noticed in my environment.
- In Programs & Features, there is no Apple Application Support to uninstall.
- In Event Viewer's Application log, you may see Event ID 10005 from Source MsiInstaller, stating the dreaded error message "A later version of Apple Application Support is already installed on this computer."
- In Event Viewer's Application log, you may see Event ID 1000 from Source Application Error, stating "Faulting application name: MsiExec.exe" along with a bunch of other error details.
- When attempting to start iTunes, you may receive popup error "Apple Application Support was not found. Apple Application Support is required to run iTunes. Please uninstall iTunes, then install iTunes again".
- Uninstalling and installing iTunes fails, including via the steps described for a "full uninstall" as described here on the Apple site (for instance: Troubleshooting issues with iTunes for Windows updates)
- Installing Apple Application Support via the extracted MSI (AppleApplicationSupport.msi) fails with the same error: "A later version of Apple Application Support is already installed on this computer."
- Installing previous versions of Apple Application Support fails with the same error (tried versions 10.7.0.21, 11.0.0.163, 11.0.1.012, 11.0.3.42, 11.1.0.126, 11.1.3.8, 11.2.2.3, 11.3.0.54, 11.3.1.2, 11.4.0.18). (now that I know the issue, I'm confident any previous version of the installer will fail).
- If you run the MSI installation with verbose logging, you may see lines stating: "PROPERTY CHANGE: Adding BNEWERPRODUCTISINSTALLED property. Its value is '1'." and "PreventDowngrade. Return value 1."
There may be other indications, but these are things we ran into. I'm trying to be detailed so that other folks who run into this issue may feel better about the below fixes being an option for them.
Resolutions:
I've found two ways to remedy the issue in our environment. You can either use the Microsoft FixIt utility to clean up the previous installation for us, or you can edit the registry manually to repair the installation. We're in an office and prefer not going computer-to-computer to fix everyone's issue independently, so we had to go via the registry. I was able to fix it via both ways, though.
Fix 1: Run the Microsoft Program Install Uninstall Troubleshooter.
For this fix you will need to be logged in as an administrator for the computer.
Here are the steps:
Download and Run the Microsoft Program Install and Uninstall FixIt: [FixIt Link]
In the troubleshooter, choose: Detect problems and apply the fixes for me (Recommended)
Choose Installing
From the list, select Apple Application Support and click Next. (it actually does appear here!)
Select Yes, try uninstall. This step could take a while to process once it starts.
Once it confirms it is fixed, click Next.
Select "Yes, the problem has been fixed" and click Next.
Finish/close the FixIt tool.
Now the Apple Application Support will install successfully on your next attempt.
- If you don't have iTunes installed, you can simply run the latest downloaded installer: iTunes64Setup.exe
- If the other iTunes components are already installed, you will need to go to Programs & Features (or Add/Remove programs) and uninstall the iTunes program, then re-install the program from the downloaded installer: iTunes64Setup.exe
- If you have the MSI, you can simple run AppleApplicationSupport.msi and carry on happily. Make sure it's the right version of the MSI (right-click it, select Properties, go to the Details tab and verify the Comment line says "Apple Application Support 3.1"). If you don't know what an MSI is... ignore this and use the installer.
iTunes should work perfectly normally for you now.
Fix 2:
If you're like me and you need to repair iTunes over a larger number of computers, then Fix 1 quickly becomes too time consuming. Thankfully, a quick registry edit will resolve the issue as well.
For more advanced users; if you're not sure what the Windows Registry is, please tread very carefully and make sure you back up the registry before you change anything!
You'll need to be an administrator on the computer to do this.
Start Registry Editor.
In Windows 8.1, you can right-click the start menu (flag in the bottom-right corner) and choose Run. Then type "regedit" and click OK.
In Windows 8, go to the Start menu, click the magnifying glass (or just start typing) and search for "regedit". The first result should be "regedit.exe" - click that.
In Windows Vista, click the Start menu, then click the little arrowing pointing to the right (>) and choose Run. Then type "regedit" and click OK.
In Windows 7 or XP, click the Start menu orb, and choose "Run...". Then type "regedit" and click OK.
Make a backup of your registry.In Registry Editor, right-click on "Computer" and choose "Export". Save the file somewhere on your computer. You'll probably never need it.. which are famous last words. Better safe than sorry!
Navigate to HKEY_CLASSES_ROOT\Installer\Products\ED0FAC38B3D873C46A13B2F861CE0313\
If the key "ED0FAC38B3D873C46A13B2F861CE0313" doesn't exist, then go to HKEY_CLASSES_ROOT\Installer\Products and make sure "Products" is highlighted.
Go to the Edit menu and choose "Find...".
Do a search for "Apple Application Support".
Your first result should be a ProductName value of "Apple Application Support".
Verify at the very bottom of Registry Editor that your current location is "HKEY_CLASSES_ROOT\Installer\Products\[GUID], where GUID is an alphanumeric string that's 32 characters long.
Right-click "Version" and choose "Modify".
In Value Data, type 0 (the number zero) and click OK.
Close Registry Editor.
You should now be able to successfully install the AppleApplicationSupport.msi or re-install iTunes. If, for whatever reason, it still detects the wrong version, go back to the Registry Editor and delete the entire key from above (so, right-click on the 'folder' named "ED0FAC38B3D873C46A13B2F861CE0313" and select "Delete"). Should never be necessary, though..
In a Windows domain there are many ways to update the registry so use whatever works best for you. I'll be adding this as a special extra step in our SCCM deployment.
I hope this helps! It took us a good many hours to track down what was stopping us from resolving the issue (and/or causing it to begin with). Suffice to say we now have a whole bunch of users who are very happy to no longer get iTunes error messages when they log into their computers or attempt to start iTunes itself.
Have a great day!

A later version of Apple Application Support is already installed on this computer - dead lock

Hello,
trying to solve itunes problems, i tried to completely uninstall itunes, as mentioned in article
http://support.apple.com/kb/ht1925?viewlocale=es_ES
(uninstall modules in order, verify uninstallation, reboot, and reinstall itunes)
However, it wasn't possible to reinstall itunes. Digging in forum i found a method to install part by part the application, by means of unraring the installer .exe file and executing modules independently.
The fist module: AppleApplicationSupport.msi won't install, because it does a check (erroneus check!!) and detects an inexistent version of Apple Application Support. It shows message: "A later version of Apple Application Support is already installed on this computer", and goes out.
After that, i can install itunes, but do not work.
I tried cleaning registry with msicuu2.exe, as mentioned somewhere to eliminate Application Support rests, but doesn't find any Application Support Installation.
Locked. Can't use iTunes.
Please, any help
Thank you very much.

Not yet. I tried apple telephone support, but couldn't get a definite answer.
In my opinion a installer program should try to install in every case, overriding any version that could be degraded. It's a nonsense that a installer program goes out without installing, suposing there are no degradation issues of the installation software.
Also, i think KB article http://support.apple.com/kb/ht1923 may need a correction, as it doesn't work fine always, and the cure is worse than the disease.

I have downloaded e-books from Leserskring on my computer. I would like to download it to my Samsung Tablet as well. It says I cannot as it was already installed by another user. I contact Leserskring and they said I installed it on my computer without cr

I have downloaded e-books from Leserskring on my computer. I would like to download it to my Samsung Tablet as well. It says I cannot as it was already installed by another user. I contact Leserskring and they said I installed it on my computer without creating an Adobe ID and cannot change the "authorization information" on my Adobe Digital Editions. If I do it now on my computer, after installing my books, I will loose all my books. Is this true or how can I correct it.

I have downloaded e-books from Leserskring on my computer. I would like to download it to my Samsung Tablet as well. It says I cannot as it was already installed by another user. I contact Leserskring and they said I installed it on my computer without creating an Adobe ID and cannot change the "authorization information" on my Adobe Digital Editions. If I do it now on my computer, after installing my books, I will loose all my books. Is this true or how can I correct it.

HT201364 Can't download Mavericks installer on recent Mac. "OS Mavericks cannot be installed on this computer", which is running 9.1.

I want to download the Mavericks installer so I have a backup installer that does not require the internet. Although, the App Store button allows me to download, I get a message that Mavericks cannot be installed on this computer.
Computer is late 2013 retina MBP 13" with lots of memory.
My OS is 10.9.1 (13B3116) currently running.
Is the App Store version of Mavericks too old (jan 16) for my rMBP?
Rick

Judging by the build number, it appears you have a special build of Mavericks installed and the App Store version (13B42) won't work with your computer.
Kappy - if I try to download Mavericks I get the message below, so apparently I can down load it again?
I also have a copy of the installer in my Applications folder, although it is in a folder.

Reinstall Lion problem: "Lion cannot be installed on this computer"

Hi, I just bought a new Mac Mini 2011 with Lion already installed on it. After use Time Machine to bring back my old data I found out the system wasn't working at the speed anyone would expect from a brand new product. As an example, it takes too long to login or to get the window to close one of the apps of the dock (it can take at least 5-6 seconds to appear...) Something that didn't even happen in my old MacBook.
For this reason I tried to reinstall Lion using the method described here: http://www.apple.com/macosx/recovery/
I even tried with the external Usb drive option but when the utility tries to verify the system I get this error message: "Lion OS 10.7 cannot be installed on this computer".
I will call Apple Techincal Service of course, but in the meantime... anybody has any idea about why this is happening?
Thanks!

Try:
Reinstalling Lion Without the Installer
Boot to the Recovery HD: Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alterhatively, 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.
Repair the Hard Drive and Permissions: Upon startup select Disk Utility from the main 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.
Reinstall Lion: Select Reinstall Lion and click on the Continue button.
Note: You can also re-download the Lion installer by opening the App Store application. Hold down the OPTION key and click on the Purchases icon in the toolbar. You should now see an active Install button to the right of your Lion purchase entry. There are situations in which this will not work. For example, if you are already booted into the Lion you originally purchased with your Apple ID or if an instance of the Lion installer is located anywhere on your computer.

My MACBOOK Pro turned out to be Snow Leopard, and later upgraded to LION. And update the EFI, I would like to replace the Snow Leopard, EFI can not boot, how do? How to use the Snow Leopard install disk to reduce EFI?

My MACBOOK Pro turned out to be Snow Leopard, and later upgraded toLION. And update the EFI, I would like to replace the Snow Leopard, EFIcan not boot, how do? How to use the Snow Leopard install disk to reduce EFI?

Do you mean some of your software does not work in Lion? Do you want to return to using Snow Leopard? If so, then do this:
Downgrade Lion to Snow Leopard
1. Boot from your Snow Leopard 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. Set the format type to Mac OS Extended (Journaled.) Click on the Options button, set the partition scheme to GUID then click on the OK button. Click on the Partition button and wait until the process has completed.
4. Quit DU and return to the installer. Install Snow Leopard.
This will erase the whole drive so be sure to backup your files if you don't have a backup already. If you have performed a TM backup using Lion be aware that you cannot restore from that backup in Snow Leopard (see below.) I suggest you make a separate backup using Carbon Copy Cloner 3.4.1.
If you have Snow Leopard Time Machine backups, do a full system restore per #14 in Time Machine - Frequently Asked Questions. If you have subsequent backups from Lion, you can restore newer items selectively, via the "Star Wars" display, per #15 there, but be careful; some Snow Leopard apps may not work with the Lion files.

Simply says "cannot install on this computer" when installing on my g4

help! i went through all the steps and just before installing, it says "cannot install on this computer" with no error code, no other buttons, and no way to resolve the problem. i'm installing on a g4. please help!

Hello,
You don't provide enough information to provide you with a definite answer. What are you trying to install? OS X, an update, a program, etc.?
If you are talking about an OS X 10.4.x update, then you should make sure that you are getting the PowerPC version and not the Intel version of that update.
If you are talking about installing OS X (or any other Mac OS), then you do need to be aware of the following:
The Mac will only install from Restore Disks / OS installation disks that meet one of the following criteria.
1) Original Retail boxed version of Mac OS that is of a later version than the computer originally shipped with.
2) Software Restore / Installation disks that originally came with that specific computer.
If you are using anything other than that, you will not be successful in getting the computer to boot from the installation disks and install the Mac OS.
If you purchased / obtained install disks from someone else, and they are not retail disks, then that could be the problem. The grey disks are an OEM disk, and are keyed to a specific computer. If they do not detect that computer when you try to install them, then it will not work.
These disks are usually labeled with machine name on them like eMac, iMac, etc.
Even if the machine you have is the same one printed on the label, it still will not likely work. Not only do they check to make sure it is the same type of computer, but they also check to see if it is the exact same revision and version that it shipped with.
If one thing is different, then they won't install.
And, as mentioned above, if you use retail installation disks, then you will need to make sure that they are of a version later than the version which came with the computer. Apple has a mechanism built-in to prevent installation of an OS that pre-dates the version which shipped on the computer.
Perhaps a bit of clarification is in order:
I don't know which version of the Mac OS came with the computer you are specifically working with, so let me just use OS 10.3.7 as an example.
So, assume that the computer originally shipped with OS 10.3.7 pre-installed from the factory.
Now, the computer (and the Mac OS) would prevent you from installing OS 10.3.6 or earlier on it. The reason for this is that the operating system needs to be aware of all the system's specific needs. It needs to know how it's power management system works, and so on.
Now for the tricky part, I mentioned that in regards to the retail boxed version that you would need to install a version later than the version which came with your computer originally. Now, that may sound funny, but here's why.
Let's suppose that OS 10.3.7 was already available before your computer was produced. And, let's suppose that a few unique customizations were necessary to make the current OS 10.3.7 run on the new machine. In that case, Apple may have released a custom "Build" of OS 10.3.7 that would run on the new system. So, in that case, the already available retail version of OS 10.3.7 may fail to work on that system. But, OS 10.3.8 would be aware of the needs of that machine since 10.3.8 would include the customizations provided in that special build of 10.3.7.
So, that is why I suggested going for a newer revision of the Mac OS when purchasing / using a retail boxed package. That way you can make sure it is aware of your system's specific needs.
I hope this helps.
Let us know if you have other questions.
P.S., if you'd like, go ahead and click the "Helpful" or "Solved" buttons on any of the posts / replies above if you feel they were helpful or adequately answered your question.

How to reinstall Mac os x 10.5.6 to my imac desktop 24 inch all in one i put in disk and held c down and it came to a message saying os x cannot be installed on this computer HELP?

Ok here lately when i came into my office and go to cut on my imac desktop 24inch all in one it would come up to a white screen with a grey folder with a question mark blinking in the center of the screen well i just want to reload the machine but when i put my Mac os x install dvd that came with it into it you gets past the folder blinking to the screen where it has the Mac os x installer bar at the top but in the middle of the screen in says Mac os x cannot be installed on this computer and has two buttons one that says ok and the other that says restart how can i get this to stop giving me this error and get to where i can just reinstall the os PLEASE HELP!!!!!!!!!!!!!!!!!!!!!!!

I understand, while you may have knowledge with PCs you don't have the diagnostic tools available to you to professionaly diagnose a Mac. Apple does not make those tools available for the general public, they are only available to Apple and AASPs. To install the OS on the machine you need to locate the original 10.5.x install disc that shipped with the machine and insert it into the SuperDrive. Below are Apples instructions for setting up the machine:
Turn on the computer.
Insert the Mac OS X Install DVD into the optical drive, or insert the MacBook Air Software Reinstall Drive into the USB port.
Restart the computer.
Press and hold the "C" key while the computer starts up. The computer will start up using the Install media. Alternatively, press and hold the Option key at startup to select the volume containing the installer.
If your are using a wireless mouse, a mouse icon should appear asking you to turn the mouse on so that the computer can discover it.
Select a language, then press the right arrow key.
Click the Utilities menu, the choose Disk Utility.
Select a volume to erase (usually called Macintosh HD).
Click the Erase tab.
Click Erase... Important: This step will completely erase your hard drive. If you have installed Microsoft Windows using Boot Camp, or have multiple partitions, this procedure will erase the partition you select.
A dialog box appears asking if you want to erase the partition: click Erase.
After the partition is erased, choose Quit Disk Utility from the Disk Utility menu.
Part Two: Installing the operating system
When the Mac OS X Snow Leopard Installer screen appears, click Continue.
When the license agreement appears, click Agree.
Select the disk you erased. It should now be highlighted with a green arrow.
Click Install. A status bar appears on the bottom of the screen while Mac OS X installs.
An Additional Information screen appears, advising you that you operating system has been installed. Click Continue.
An Install Succeeded screen appears. Click Restart.
Part Three: Completing the Mac OS X Setup Assistant
When the restart has completed, a welcome video plays, then country/region selection screen appears.
Select your country or region and click Continue.
Select a keyboard layout and click Continue.
A migration screen appears. If you wish to migrate your data from another Macintosh, see Migration tips and tricks. If you do not wish to migrate, or want to migrate later, select "Do not transfer my information now" and click Continue.
A Wireless Service screen appears if you have wireless services available within range of your computer. Select "On" and click Continue.
If the network is password protected, you be asked for a password when you select it. Type the password and click Continue.
An Apple ID screen appears. This is used to purchase content from the iTunes store. When complete, click Continue.
If you do not have an Apple ID, click Continue to move to the next screen.
A Registration Information screen appears. You are not required to fill this out, but it is helpful if you do. When complete, click Continue and your product registration will be sent immediately.
If Mac OS X servers are available on your network, you'll be asked if you'd like to log on to them. If not, click Continue.
A Create Your Account screen appears. This will be used to create a User Account with Login ID and Password for you computer. You should remember this password. You'll be asked for it when you install new software or perform other administrative tasks on your computer. When complete, click Continue and your account will be created immediately.
A screen to select your user picture appears. Take a snapshot with the built-in camera or select a picture from your Library. When complete, click Continue.
A MobileMe screen appears. Select an option and click Continue.
A Thank You screen appears. Click Go to complete the Mac OS X Setup Assistant.
Eject the Mac OS X Install DVD by dragging its icon to the Trash.
Good luck.

OS X v10.9.3 is already installed on this computer. Use the Updates page to install the 10.9 update or if you would like to download the full OS X installer click Continue."

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