I'm running OSX 10.9.2, when my system updated it required my Apple ID... When I provided it, it said that AppleID hadn't been used at the App Store... so now I'm locked out of my system... what do I do??

Question

Suggestions Re: I'm running OSX 10.9.2, when my system updated it required my Apple ID... When I provided it, it said that AppleID hadn't been used at the App Store... so now I'm locked out of my system... what do I do??

Answer 1

First, there are no PPC Macs that can run Snow Leopard or later. Did you buy your iMac used? Where did you get Mavericks in the first place? If it was installed by the seller, then you are not licesnsed to use his/her copy.
Do you know exactly what iMac model you have? If it's a post 2010 model you can do the following:
Install Mavericks, Lion/Mountain Lion Using Internet Recovery
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.
Boot to the Internet Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND-OPTION- R keys until a globe appears on the screen. Wait patiently - 15-20 minutes - until the Recovery main menu appears.
Partition and Format the hard drive:
1. Select Disk Utility from the main menu and click on the Continue button.
2. After DU loads select your newly installed hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. 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. Quit DU and return to the main menu.
Reinstall Lion/Mountain Lion. Mavericks: Select Reinstall Lion/Mountain Lion, Mavericks and click on the Install button. Be sure to select the correct drive to use if you have more than one.
Note: You will need an active Internet connection. I suggest using Ethernet
            if possible because it is three times faster than wireless.
This should restore the version of OS X originally pre-installed on the computer. You may then go to the App Store to download Mavericks using your Apple ID.
If you have a 2010 model you may require a special firmware upgrade before you can do the above: Computers that can be upgraded to use OS X Internet Recovery.
If you have an earlier iMac then you must get Snow Leopard 10.6.8 installed by installing a version of Snow Leopard either included on the software restore discs or:
Upgrading to Snow Leopard
You can purchase Snow Leopard through the Apple Store: Mac OS X 10.6 Snow Leopard - Apple Store (U.S.). The price is $19.99 plus tax. You will be sent physical media by mail after placing your order.
After you install Snow Leopard you will have to download and install the Mac OS X 10.6.8 Update Combo v1.1 to update Snow Leopard to 10.6.8 and give you access to the App Store. Access to the App Store enables you to download Mavericks if your computer meets the requirements.
     Snow Leopard General Requirements
       1. Mac computer with an Intel processor
       2. 1GB of memory
       3. 5GB of available disk space
       4. DVD drive for installation
       5. Some features require a compatible Internet service provider;
           fees may apply.
       6. Some features require Apple’s iCloud services; fees and
           terms apply.