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I'm afraid I'm out of ideas sophiaa_c
Although starting your Mac in "safe mode" should have obviated any concern about what may be preventing it from downloading, please consider running EtreCheck in accordance with the instructions below. It may reveal a clue that may help.
None of what follows is intended to fix anything, but it will provide additional information required to advance troubleshooting.
If your Mac is not already running Lion or later, and you can't find your original grey OS X Install DVD, just bypass the first section regarding OS X Recovery and Disk Utility.
If you are running OS X "Lion" or later, boot OS X Recovery by holding â and r (two fingers) while you start your Mac. For Snow Leopard, start your Mac while holding the c key with its original OS X Install DVD inserted in its optical drive.
At the Mac OS X Utilities screen, select Disk Utility. Select your startup volume (usually named "Macintosh HD") and click the Repair Disk button. Describe any errors it reports in red.
When it finishes restart your Mac and test again for operation. If it's still not behaving as you expect it should, please post the results of EtreCheck in accordance with the following instructions:
Apple Support Communities contributor etresoft wrote a very useful app to quickly gather certain system information that may help point to a cause of this problem. Go to his website, download and run EtreCheck:
http://www.etresoft.com/etrecheck
Etrecheck will be in your Downloads folder. Open it from there. You may see the following dialog box:
Click Open - etresoft contributes to this forum frequently and can be considered a trustworthy developer.
It will take a moment to run as it collects its data.
Copy and paste its output in a reply.
Do not be concerned about anything that says "Problem" or âfailedâ or anything else that may appear in red.
EtreCheck was designed to remove any personal information (such as your computer's name and serial numbers) but if you see anything that looks like an email address or any other personal information that should not be divulged to others, please delete or obscure that information when you post the reply.
When you are finished with EtreCheck, quit the program. It occupies very little space, and you can keep it or drag it to the Trash as you wish.