IMac mid 2007 and need help

I have an iMac mid 2007 and just upgraded my memory to 3GB (tried 4 but didn't work). Now I need to update my operating system, can I go straight to mountain lion?
Here are my specifications
MAC OS X
Version 10.4.11
2 GHz Intel core 2 duo
3 GB 667 MHz DDR2 SDRAM
Mid 2007 21 inch

You can install OS X Mountain Lion. First, buy Snow Leopard > http://store.apple.com/us/product/MC573/mac-os-x-106-snow-leopard Then, make a backup, insert the DVD and upgrade. Finally, go to  > Software Update and install the most recent version.
Open App Store and purchase Mountain Lion. Check if your programs are supported > http://www.roaringapps.com

Similar Messages

  • Imac mid 2007 with mac ox lion reformat with what os

    hi i have a imac mid 2007 and i have with mac os x lion with it and i wanna reformat it because its so slow what os do i will install again?

    You may just need to reinstall, not reformat:
    Reinstalling Lion/Mountain Lion Without Erasing the Drive
    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. 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.
    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/Mountain Lion: Select Reinstall Lion/Mountain Lion 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.

  • I have a rather old iMac 20" (mid 2007) and I want to upgrade the Hard drive. How do I change it? How do I transfer all my applications? May I just copy the old hd into the new one? Thanks.

    I have a rather old iMac 20" (mid 2007) and I want to upgrade the Hard drive. How do I change it? How do I transfer all my applications? May I just copy the old hd into the new one? Thanks.

    There are many online tutorials on how to change out the HD on a mid 2007 iMac. One of the originals is from 2007 and is Upgrade your iMac 20" or iMac 24" aluminum (mid 2007) to 1TB Hard Drive and 4 GB RAM - DIY Guide. As far as migrating your system Apple helps out with that in Setup Assistant which automatically starts when you turn on a new Mac for the first time. After you have installed the new HD you will have to format the new HD to Mac OS Extended (Journaled) and then you will have to install OS X. The first time you turn it on Setup Assistant will start. Follow the directions and you will be fine. In order to restore your information you will need to backup what is on the current internal HD first. I'd recommend using Time Machine (Assuming you are using Leopard or later) AND also creating a bootable clone using either SuperDuper or Carbon Copy Cloner.
    Please complete your profile so at the very least we know what version of OS X your machine has installed.

  • I am setting up a new iMac and need help syncing files to Dropbox.  On my old computer I had it set where when I saved a document, it was saved on my hard drive, as well as to a folder in Dropbox.  I can't remember how I set this up.  Any help?

    I am setting up a new iMac and need help syncing files to Dropbox.  On my old computer I had it set where when I saved a document, it was saved on my hard drive, as well as to a folder in Dropbox.  I can't remember how I set this up.  Any help?

    The way that Dropbox works is that it keeps a copy of all your files in your local Dropbox folder on your hard drive (which is, by default, directly under your home folder). Adding files to that folder will sync them to the Dropbox server.
    You do of course have to download the Dropbox application to enable this (download link at the top right of http://dropbox.com ).
    Matt

  • I have an iMac (Mid 2010) and am running 0sx 10.8.5 and the WiFi always loses connection during sleep mode. I have seen numerous different solutions none of which seem to work. Can anyone help?

    I have an iMac (Mid 2010) and am running 0sx 10.8.5 and the WiFi always loses connection during sleep mode. I have seen numerous different solutions none of which seem to work. Can anyone help?

    Test after taking each of the following steps that you haven't already tried. Back up all data before making any changes.
    1. Make sure the network is on the preferred list by following these instructions. It's important to read the article carefully, as it's the starting point for any further efforts to solve the problem. If you skip any of the steps, the problem may not be solved. Make sure the box marked
              Remember networks this computer has joined
    is checked.
    2. Follow the instructions in this support article under the heading
              Symptom: After restarting or waking from sleep, my computer might not connect to the Internet
    3. Reset the PRAM.
    4. Make a note of all your settings for Wi-Fi in the Network preference pane, then delete the connection from the connection list and recreate it with the same settings. You do this by clicking the plus-sign icon below the connection list, and selecting Wi-Fi as the interface in the sheet that opens. Select Join other network from the Network Name menu, then select your network. Enter the password when prompted and save it in the keychain.
    5. From the Location menu at the top of the Network preference pane, select Edit Locations. A sheet will drop down. Click the plus-sign button to create a new location. Give it any name you want. In the new location, set up the Wi-Fi service with the same settings you used before. Click Apply and test.
    6. Launch the Keychain Access application. Search for and delete all AirPort network password items that refer to the network. Make a note of the password first.
    7. Repair permissions on the startup volume.
    8. Turn off Bluetooth and test.
    9. Reset the System Management Controller.
    10. This step shouldn't be necessary, but has been advised by Apple Support in some cases, apparently as a workaround for a bug. Open the Energy Saver pane in System Preferences. If applicable, click the padlock icon in the lower left corner to unlock the settings. Enter your administrator login password when prompted.
    Select the Power Adapter tab and uncheck the boxes marked
              Wake for Wi-Fi network access
    and
              Enable Power Nap...
    if present. Then, if the computer is a MacBook, select the Battery tab and uncheck
              Enable Power Nap...
    11. Reinstall OS X.

  • Have installed 10.10 on my iMac (mid 2007) 2.4 GHz 2Gb memory which has slowed to a crawl

    have installed 10.10 on my iMac (mid 2007) 2.4 GHz me 2 GB which has slowed to a crawl

    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.
    4. Reinstall Yosemite: Reboot from the Recovery HD. Select Reinstall OS X 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.
    5. Reinstall Yosemite from Scratch:
    Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.
    How to Clean Install OS X Yosemite
    Note: You will need an active Internet connection. I suggest using Ethernet if possible
                because it is three times faster than wireless.

  • Problems with FileVault 2 on my iMac mid 2007 with Mac OS LION on it

    Hi guys !
    Get a problem with FileVault 2 on my iMac mid 2007 with MAC OS LION on it. FileVault 2 works, but after rebooting my system, it was unpossible to select an account with the cursor of my trackpad. No chance.
    Before activate Filevault 2 the trackpad works fine. No problems to select an account. Anybody else with the same problem ?
    Regards
    Volker

    Hi EVO67 !
    I checked out your solution, but.... sorry it doesn't works.
    So I cut off the bluetooth connection of the magic trackpad from my iMac and pair it again, but the problem is the same.
    May be it's bigger bug with LION, so I need an update for this function.
    But thank you very much for your help.
    Regards
    Volker

  • Why won't my IMac Mid 2007 not work with ANY Microphone?

    So I have recently received an IMac (Mid 2007) model that is used from my uncle. It is in GREAT condition with one flaw which I found out during a skype call. The mic didnt work. So I opened preferences, went to sound, went to input and saw that it was in "Internal Microphone". I changed it to Line In and used a separate microphone, still didnt work. Used another microphone to make sure it wasnt broken, didnt work. I have been looking online and didnt find anyone with my problem. It is so weird and I can't figure it out. On the other line the only time my friend (in the skype call) could hear anything was when I plugged in the external microphone and he thought it might work. I tried the sound with photo booth, skype, and just plain old volume. PLEASE HELP! I need to skype during my work on the computer!!! Thank you very much!
    Also If you are willing to help out with other questions please do.
    I have seen people run Windows 8 on a Mac product and would be willing to do that if there are no side effects to the cpu. Please tell me if there are any issues doing that, and if not tell me how.
    This computer has 2GB of ram right now and is expandable to 6GB of ram. Is it possible to expand it over 6? And is it very difficult?
    Should I upgrade to Mavericks. It is free and easy to download but I have been told that due to my low ram I should wait until I pump it up to 4 or 6GB of ram and then upgrade.
    THANK YOU SO MUCH!!!

    Isnt line in just a fancy word for a plug that looks like headphones?
    No. The term "line in" refers to the signal level the input can accept. It has nothing to do with the type of socket/plug.
    I just checked what Line in is and i do have a line in spot in my mac. So why would i need to buy the IMic?
    Because you need a microphone-level input, which can accept the lower level of signal that a microphone puts out, and again, no Mac has had a microphone-level input in years. Line level is a much stronger signal.
    So you need:
    - a microphone that puts out a line-level signal. There are a few, but not many.
    or
    - a USB microphone
    or
    - an audio device that can accept a microphone-level signal. The Griffin iMic is one, but there are others.
    Regards.

  • Is my internal hard drive dead?!? (iMac mid-2007)

    Hi everyone,
    My aluminum iMac (mid-2007) is behaving strangely recently. I'm suspecting some internal hard drive failure. Here are the symptoms:
    1) Difficult wakeups from sleep mode: two times out of three, the spinning beachball appears on each open application, making the iMac unusable, almost frozen. I have to hard reboot.
    2) One reboot out of two fails, with the "question mark folder" appearing, just like if the iMac could not detect an internal hard drive.
    3) In the Finder, the spinning beachball appeared once with an error message: "The drive has not been ejected properly". Of course I didn't eject or disconnect any drive... There was also an icon "SystemUI Server" appearing in the Dock! I was forced to hard reboot.
    4) Made all the usual stuff: all Onyx tests and repairs + Apple Hardware Test full tests + permission and disk repairs + PRAM/SMC reset... No problems detected, but nothing resolved in the end. (The only thing I haven't tested yet is Techtool Pro or DiskWarrior.)
    I think this is an internal hard drive problem, but I'd like to have a confirmation from you, forum pros. Would a hard drive replacement fix the problem? Or is the internal drive OK but some connection to the drive not working anymore, making a HD replacement useless? (Sorry if this is nonsense, but I'm not very skilled in hardware stuff.)
    In other words, any help would be appreciated. (And my AppleCare expired some weeks ago! Talk about bad luck...)
    Thanks in advance for any help!

    D.F. wrote:
    Done! Installed a new HD following the instructions of this site. Everything works perfectly again.
    Yay!
    But I'm still disappointed that my original internal hard drive chose to die two weeks after my AppleCare three-year warranty expired!
    The original HD was a Western Digital. Is WD a crappy brand?
    You'll get widely different opinions on that. Many folks say their --cheap-- inexpensive ones are "junk;" others say they've had several that ran for years.
    Some say the ones Apple uses are better quality -- not quite server grade, but better than the run-of-the mill consumer products.
    As with any manufactured product, disk drives may have a few early failures (even in the first days or weeks); a few will last for many years, most will last for 2-4 years or so. Even under identical circumstances, there's no predicting the life span of any one drive.

  • IMac Mid 2007 (OS X Mavericks 10.9.4) doesn't go to sleep

    Hello, i have an issue with my iMac Mid 2007 with OS X Mavericks :
    On my primary account my mac never goes to sleep even if there is no app open or itunes or spotify playing.
    I've tried to disable everything and restore energy savings default but didn't work
    I've done a SMC reset e PRAM reset, no change.
    On a partition with yosemite public beta it sleeps normally and in bootcamp partition i didn't check but i think it goes to sleep.
    If i use another account with Mavericks it goes to sleep as well so there should be something wrong with my account or some app installed...
    I did not install anything new recently, only chrome beta 64bit.
    I have an SSD on this iMac and 6Gb of ram... i thought the problem was spotify but even if uninstalled it doesn't sleep.
    pmset -g assertionts in terminal gives :
    13/09/14 08:36:20 CEST 
    Assertion status system-wide:
       BackgroundTask                 1
       PreventDiskIdle                0
       ApplePushServiceTask           0
       UserIsActive                   0
       PreventUserIdleDisplaySleep    0
       InteractivePushServiceTask     0
       PreventSystemSleep             0
       ExternalMedia                  0
       PreventUserIdleSystemSleep     1
       NetworkClientActive            0
    Listed by owning process:
       pid 280(coreaudiod): [0x0000000100000166] 01:35:21 NoIdleSleepAssertion named: "com.apple.audio.'AppleHDAEngineInput:1B,0,1,0:1'.noidlesleep"
       pid 88(apsd): [0x0000000c00000309] 00:00:02 ApplePushServiceTask named: "com.apple.apsd-recreatecachedictionaries-push.apple.com"
    Kernel Assertions: 0x4=USB
       id=500  level=255 0x4=USB mod=13/09/14 07:01 description=EHC1 owner=AppleUSBEHCI
       id=501  level=255 0x4=USB mod=13/09/14 07:01 description=EHC2 owner=AppleUSBEHCI
       id=504  level=255 0x4=USB mod=13/09/14 07:06 description=UHC3 owner=AppleUSBUHCI
       id=506  level=255 0x4=USB mod=13/09/14 07:07 description=UHC4 owner=AppleUSBUHCI
    It seems there is always a process with coreaudio that prevents system from sleep.
    Do i need to reinstall os x mavericks again?
    I have another issue too regarding the image file preview, usually are shown but sometimes when i reboot or start my mac previews are not shown and i have to check in the finder option "Show file preview" again to get it right...
    Thanks in advance

    No i've checked that before posting and i did all that steps... anyway i think i resolved my issue...
    Even reinstalling mavericks didn't fix the issue, so i installed yosemite public beta 3 on my primary partition and that still didn't fix the problem with coreaudio...
    Anyway i unloaded coreaudiod
    sudo launchctl unload -w /System/Library/LaunchDaemons/com.apple.audio.coreaudiod.plist
    In Finder i moved to /System/Library/LaunchDaemons and moved to Desktop com.apple.audio.coreaudiod.plist
    After reboot there was no audio and no coreaudiod process preventing sleep of course so i moved back coreaudiod.plist to /System/Library/LaunchDaemons
    and
    sudo launchctl load -w /System/Library/LaunchDaemons/com.apple.audio.coreaudiod.plist
    This enabled the audio and now in terminal pmset -g assertions shows :
    2014-09-16 23:27:03 +0200
    Assertion status system-wide:
       BackgroundTask                 0
       ApplePushServiceTask           0
       UserIsActive                   0
       PreventUserIdleDisplaySleep    0
       PreventSystemSleep             0
       ExternalMedia                  1
       PreventUserIdleSystemSleep     0
       NetworkClientActive            0
    Listed by owning process:
       pid 29(powerd): [0x000000120008012c] 00:07:45 ExternalMedia named: "com.apple.powermanagement.externalmediamounted"
    Kernel Assertions: 0x4=USB
       id=500  level=255 0x4=USB mod=16/09/14 23:19 description=EHC1 owner=AppleUSBEHCI
       id=501  level=255 0x4=USB mod=16/09/14 23:19 description=EHC2 owner=AppleUSBEHCI
       id=503  level=255 0x4=USB mod=16/09/14 23:27 description=UHC3 owner=AppleUSBUHCI
       id=505  level=255 0x4=USB mod=16/09/14 23:24 description=UHC4 owner=AppleUSBUHCI
    That is quite normal and this way my mac goes to sleep...
    I'll check if it's the latest installation of spotify causing this issue...
    Thanks for the reply.

  • Bluetooth pane has gone missing since update from 10.10.2 to 10.10.3 on iMac mid 2007

    I have a iMac mid 2007 model. I was running os x 10.10.2 with no problems. I update to os x 10.10.3 for the security issue. Now my bluetooth pane has gone missing from system preferences. I have tried everything suggested in suggested in support as it seems others have suffered the same thing on different macs. Nothing has that was suggested there has corrected this issue. Does anyone have any ideas apart from using a wired mouse and keyboard or using time machine to revert to os x 10.10.2? Let me know please.
    Also booting up is slow to say the least, I can live with that though unless there is an as yet unknown by me fix.

    Please read this whole message before doing anything.
    This procedure is a test, not a solution. Don’t be disappointed when you find that nothing has changed after you complete it.
    Step 1
    The purpose of this step is to determine whether the problem is localized to your user account.
    Enable guest logins* and log in as Guest. Don't use the Safari-only “Guest User” login created by “Find My Mac.”
    While logged in as Guest, you won’t have access to any of your documents or settings. Applications will behave as if you were running them for the first time. Don’t be alarmed by this behavior; it’s normal. If you need any passwords or other personal data in order to complete the test, memorize, print, or write them down before you begin.
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    Please take this step regardless of the results of Step 1.
    Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards, if applicable. Start up in safe mode and log in to the account with the problem. You must hold down the shift key twice: once when you turn on the computer, and again when you log in.
    Note: If FileVault is enabled in OS X 10.9 or earlier, or if a firmware password is set, or if the startup volume is a software RAID, you can’t do this. Ask for further instructions.
    Safe mode is much slower to start up and run than normal, with limited graphics performance, and some things won’t work at all, including sound output and Wi-Fi on certain models. The next normal startup may also be somewhat slow.
    The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
    Test while in safe mode. Same problem?
    After testing, restart as usual (not in safe mode) and verify that you still have the problem. Post the results of Steps 1 and 2.

  • HT1338 The Software Update function on my iMac mid 2007 with OS X 10.8.2 fails to see new software

    The Software Update function on my iMac mid 2007 with OS X 10.8.2 fails to see new software ,not with /Apple/Software Update or /About this Mac or /System Preference/Software Update, the problem started already with 10.8 and I had to download the 10.8.2 Combo manualy, installation was succesful, but since iPhoto11 (9.4) is now available my existing iPhoto11 (9.3.2) will not detect updates using AppStore or all the other ways, Any idee is welcome.

    Glad you got your Mac fixed. But I hope you realize that an update can always go awry; corrupted download, stray voltage spike in your AC power, even a bug in the Installer of the Update. That's why it's never a good idea to update anything that affects your business for at least a week or even two AFTER the update comes out.
    And this applies not just to the OS Update, it may be even more important with an update to one of the apps you need for your business! 8-| There's hardly ever a valid reason to make an Update while working on a clients task. Certainly no reason to make an Update during the work week. That's what Week Ends are for! LOL!
    Basic rule for the OS Update, for me, anyway, is to NEVER use the Software Update version. I ALWAYS go to the Apple site and download the Combo Updater. It's often much larger, but it's never failed me. Maybe just that fewer people are hitting that server! Who knows? Who cares?
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    Third basic rule, try the download a second time. Bits/electrons are very slippery! Some have been known to fall out of the Internet "tubes!"

  • Can't Transfer my info from Imac( mid-2007) to my macbook pro (mid-2009)

    Hello,
    i bought a macbook pro today and I'm having trouble transferring my data from my Imac(mid-2007) to my macbook pro. I do not own a firewire cable unless it comes with the computer? I was doing it wirelessly and after i entered the code said it was transsferring data. But after a minute it cam up with this notice,"There was an error connecting to the network, and the information on the other Mac couldn't be accessed." What should i do? Does anyone else have this problem? Did you fix it?
    Thanks!
    -cobras7

    You can make the transfer using an Ethernet cable. From you machine description, I can't tell if you will need a crossover (Ethernet) cable or not. Here is the info you will need to do the transfer via Ethernet.
    1. http://support.apple.com/kb/HT1433
    2. http://support.apple.com/kb/HT2274?viewlocale=en_US

  • HT201257 I have an iMac (Mid 2007) upgraded to Lion OS. My fan runs all the time at high speed. I tried the SMT reset without results. I could not try the AHT test because it is not on my computer or install disk. Any suggestions what I can do to correct

    I have an iMac (Mid 2007) upgraded to Lion OS. My fan runs at high speed all the time. I reset the SMT without results. I had no way to do the hardware test.
    Can I fix this high fan speed?

    Open Activity Monitor in the Utilities folder.  Select All Processes from the Processes dropdown menu.  Click twice on the CPU% column header to display in descending order.  If you find a process using a large amount of CPU time, then select the process and click on the Quit icon in the toolbar.  Click on the Force Quit button to kill the process.  See if that helps.  Be sure to note the name of the runaway process so you can track down the cause of the problem.
    If the above doesn't help then create a new user account. Log into the new account. Does this fix the problem?

  • Imac (mid 2007) - which OS to install?

    Hi there,
    I have recently lost my early 2006 macbook. It has had numerous issues such as the common flickering screen, and the bulging battery issue. I was going to attempt to install a new inverter and battery in it but instead, i was able to find a 24" mid 2007 imac with a failed hard drive. My friends were going to dump it as they are going to get a new imac 5K so i decided to take it home. I installed a 1tb disk in it and 6gb of ram to bring it up to modern standards. It comes packaged with 10.5.8 (Leopard).
    I also picked up a used magic trackpad for it but only to realize after that it requires 10.6 to run the magic trackpad.
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    Thank you very much for your time.

    My personal preference for you is to purchase a OS X 10.6 Snow Leopard install disc, then update to OS X 10.6.8 and STAY THERE!
    Your IMac will run its best on OS X 10.6.8 Snow Leopard.
    Mac OS X v10.6 Snow Leopard system requirements
    Purchased Installer disc here.
    http://store.apple.com/us/product/MC573Z/A/mac-os-x-106-snow-leopard
    To install Snow Leopard for the first time, you must have a Mac with:
    An Intel processor
    An internal or external DVD drive, or DVD or CD Sharing
    At least 1 GB of RAM (additional RAM is recommended)
    A built-in display or a display connected to an Apple-supplied video card supported by your computer
    At least 5 GB of disk space available, or 7 GB of disk space if you install the developer tools.
    Later versions of OS X are more memory intensive and lean more towards being a hybrid of OS X and IOS.
    The only other choice I do not really recommend, but your 2007 IMac may run okay on it is once your IMac is upgraded to OS X 10.6.8, purchase an email download code for OS X 10.8 Mountain Lion.
    To install OS X  10.8 Mountain Lion, 10.9 Mavericks (currently unavailable) or OS X 10.10 Yosemite.you need one of these Macs:
    OS X 10.8 Mountain Lion purchased emailed download code here.
    http://store.apple.com/us/product/D6377Z/A/os-x-mountain-lion
    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)
    Your Mac also needs:
    OS X Mountain Lion, Lion, or Snow Leopard v10.6.8 already installed
    2 GB or more of memory (I strongly advise, at least, 4 GBs of RAM or more)
    8 GB or more of available space
    While there is the free OS X 10.10 Yosemite for immediate download on the Mac App Store, your iMac model will run a lot slower on this OS X version and is NOT without plenty of issues and really is not ready for use as an everyday OS.
    My opinion here, stay away from installing OS X Yosemite for quite awhile.

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