Will reinstalling OS X Mavericks delete my files if there are no backup?

My iMac will not start up. It just powers on, then apple logo shows up with a loading bar underneath it and then powers down. I tried performing a disk repair, but it says that it could not be repaired, and to backup the data. Apple has told me to reinstall the software, but I am worried that it will delete my files if I do. Thank you!

Read this:
OS X Mavericks: Reinstall OS X
Incidentally, EVERYONE should have a backup of their system in case something happens.
Barry

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Reinstalling Just OS X - does just that, gives you a new copy of OS X and doesn't touch your Users or programs
(unless the program has a kext file in OS X, then of course that gts kicked out, so just reinstall those few programs that do)
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I need to recover deleted data from my iPhone 4S but don't have a recent backup. I thought by pressing sync on my macbook this would back up…but I was wrong. There are no backups on my macbook and the latest backup on iCloud was Jan 2012. My mum died in May and I had lots of text messages that I wanted to keep. I really want to get them back. Is there any way at all I can get that deleted data from the phone?

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HT201364 Upgrade to Mavericks/deleting picture files

I am wanting to upgrade to Mavericks however I only have a bit over 6G of space available due to the fact that I have a lot of memory tied up in picture files. I have backed up my files on an external drive, but am fearful that my picture files will be lost if I delete them from iphoto to free up space. Do I need to export the pictures to the external drive. I have done that to some of my pictures already. I'm just not sure how to go about saving them.

When I look in finder under pictures I see the iphoto and photo booth. If I send THAT to my external drive does it save the whole 24GB of information including the program and all or just the files? I have Time machine set to back up to a Seagate extrernal drive. Have I already saved it? I also have an iMac. What is the easiest way to move files from my MacBook Air to the iMac? I was wanting to set up iCloud, however, it says to have Mavericks installed first and that is where my whole problem started. I do not have enough space on my MacBook Air to install Mavericks. I thought the easiest way to free up space would be to delete picture files. But my pictures are linked to Facebook and Flicker. Last time I deleted pictures from my Mac they also disappeared from Facebook. How can I prevent that from happening.
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Quicktime movies will not play if I delete 'media' files

I have created several Quicktime movies so that I can see the movies after I delete the imported media files which are quite large. But after I delete those files I cannot play the Quicktime movie. I get messages saying that the parts cannot be found. If I reinstall the 'media' files, the movie plays again. It seems that the Quicktime movie is somehow linked to the media files. This shoudn't be, should it?
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Well, I'm just saving the movie to the desktop and then trying to play it back after I've deleted the media files.
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Suddenly, one of my iPhoto Libraries will not open, or rather iPhoto opens, but says there are no photos in the file. However, when I backed it up and looked into it otherwise, the images 86gigs are still there in the file. What to do??

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To move from iPhoto 08 (which is v7) to iPhoto 11 (which is v9) requires that you purchase iPhoto 11. Your software update is running just fine. V7.1.5 is last version of iPhoto 08.
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In the iPhoto Preferences -> Events Uncheck the box at 'Imported Items from the Finder'
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Deleting & renaming files - is there a shortcut to finder?

I am a recent convert from PC to Mac. So far so good. However, one thing starts to drive me up the wall which is deleting/renaming files in programs such as photoshop, word, excel etc.etc.
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fupe

Hi Greg,
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fupe

Microsoft Excel cannot access the file "-". There are several possible reasons. Windows Server 2008 R2 with Microsoft Office 2010

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Enabled all macros in Excel application and set the Trust Center.
Add the user to have full control on all folders that contain the Excel file.
Under DCOM
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I am wondering if this has anything to do with having the user log into Excel.
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I just ordered the family pack. And was concerned about losing data while updating to snow leopard. What are general precautions before making such a giant change to my iMac?
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Will reinstalling OS X Mavericks delete my files if there are no backup?

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