I cant log onto app store through my macbook air - an unknown error keeps occuring
Ive been trying to log onto the app store and i cant manage to get on - the system keeps saying that there is an unknown error when i try to log on. I have tried to do the whole reset the system using the alt and power button (i bought this mac second hand so i also want to restore to factory settings). I was thinking that the reason app store wouldnt work is because the previous user might not have reset the system properly? i can log onto all the other applictions with my apple ID perfectly fine, its just with the app store. any help is hugely appreciated!!!
The first thing you should do with a second-hand computer is to erase the internal drive and install a clean copy of OS X. How you do that depends on the model. Look it up on this page to see what version was originally installed.
If the machine shipped with OS X 10.4 or 10.5, you need a boxed and shrink-wrapped retail Snow Leopard (OS X 10.6) installation disc, which you can get from the Apple Store or a reputable reseller — not from eBay or anything of the kind. If the machine has less than 1 GB of memory, you'll need to add more in order to install 10.6. I suggest you install as much memory as it can take, according to the technical specifications.
If the machine shipped with OS X 10.6, you need the installation media that came with it: gray installation discs, or a USB flash drive for some MacBook Air models. If you don't have the media, order replacements from Apple. A retail disc, or the gray discs from another model, will not work.
To boot from an optical disc or a flash drive, insert it, then reboot and hold down the C key at the startup chime. Release the key when you see the gray Apple logo on the screen.
If the machine shipped with OS X 10.7 or later, you don't need media. It should boot into Internet Recovery mode when you hold down the key combination option-command-R at the startup chime. Release the keys when you see a spinning globe.
Once booted from the disc or in Internet Recovery, launch Disk Utility and select the icon of the internal drive — not any of the volume icons nested beneath it. In the Partition tab, select the default options: a GUID partition table with one data volume in Mac OS Extended (Journaled) format. This operation will permanently remove all existing data on the drive, which is what you should do.
After partitioning, quit Disk Utility and run the OS X Installer. When the installation is done, the system will automatically reboot into the Setup Assistant, which will prompt you to transfer the data from another Mac, its backups, or from a Windows computer. If you have any data to transfer, this is usually the best time to do it.
You should then run Software Update and install all available system updates from Apple. If you want to upgrade to a major version of OS X newer than 10.6, buy it from the Mac App Store. Note that you can't keep an upgraded version that was installed by the previous owner. He or she can't legally transfer it to you, and without the Apple ID you won't be able to update it in Software Update or reinstall, if that becomes necessary. The same goes for any App Store products that the previous owner installed — you have to repurchase them.
If the previous owner "accepted" the bundled iLife applications (iPhoto, iMovie, and Garage Band) in the App Store so that he or she could update them, then they're linked to that Apple ID and you won't be able to download them without buying them. Reportedly, Apple customer service has sometimes issued redemption codes for these apps to second owners who asked.
If the previous owner didn't deauthorize the computer in the iTunes Store under his Apple ID, you wont be able toauthorize it under your ID. In that case, contact iTunes Support.
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Try deleting the cache associated wi the App Store.
Quit the App Store if it's open.
Now open the Finder. From the Finder menu bar click Go > Go to Folder
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Check your mac's Serial Number.
Some people have problems with missing serial numbers on their Macs and that's the message you get when this happens.
Click on the Apple at the top left of the screen, open "About this Mac" and click on "More Info". You should see a list with information about your Macbook Air. Check that on the Serial Number field you have your Mac's Serial. If you have "SystemSerial#" written instead then that's your problem.
You can re-enter your serial number if you have a USB CD drive, it's not very straightforward but I can walk you through it if you need it.
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