MacBook Air not functioning properly

Hi all, my MacBook Air (running on Lion OS X while downloading Mavericks, purchased in 2012) is not functioning properly. Over the summer I tend to not use my laptop a lot since I mainly use it for schoolwork. I had opened my Air for the first time in a while and it was fine - however after that I had left the screen open and the screen went dark. I had left my Air open for a few weeks and when I tried to turn it on, it would not do anything. It would not respond to anything I did and eventually had to restart my computer in SafeMode. I thought I had fixed my problems however a few applications were giving me trouble
iPhoto would not open at all and after many failed attempts to debug my issues, I had to delete the application from my computer entirely. Eventually I tried to redownload it from the appstore but it wouldn't work so I gave up.
Recently, I noticed that my Mail application will not open (even though the system preferences for it will). I also noticed that a few of my System Preferences will not open - Energy Saver, Desktop & Screen Saver, and Spotlight.
I am currently downloading the newest update, Mavericks. I did download Mountain Lion, however when I rebooted my laptop over the summer in Safe Mode I must have reverted back to a back up that did not have Mountain Lion downloaded into my computer.
I am at a loss of what to do.

check my questions looks similar problem and I have solve it
airplay doesn't work after I bought a new wireless router
hope it fix yours too

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HI everyone,
I have a 2014 MacBook Air running Yosemite and it has been completely functional until Friday morning when it rebooted itself without any input from myself. I was on a webpage and the screen went white before going to the Apple logo and loading bar. It stays on 50% and does not move... Occasionally after powering it down I cab get to the log in screen but cannot actually log in (the beachball of death spins and spins)
I have loaded it in Safe mode but cannot log in, have gone through Disk Utility (Cmd R) and checked the drives are functioning and I have reinstalled the OS. Just now i have done a PRAM check too... I am totally stuck now and if anyone has some advice then I am all ears.
Thanks in advance,
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If you have reinstalled the OS and it still doesn't work, then I'm sorry to tell you it's likely a hardware problem, which needs checking at a Genius Bar in a local Apple Store or at a Certified Service Provider.
Use this page to find one near you: https://locate.apple.com/country
If you have none nearby, I suggest you get it sent to Apple to get repaired. To do so, contact Apple Support here: http://www.apple.com/support/contact/

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Any ideas please???

If you don't already have a current backup, back up all data, then reinstall the OS. You don't need to erase the startup volume, and you won't need the backup unless something goes wrong. If the system was upgraded from an older version of OS X, you may need the Apple ID and password you used to upgrade.
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If the user account is associated with an Apple ID, and you know that account password, the Apple ID can be used to reset your user account password.
Otherwise, boot into Recovery by holding down the key combination command-R at startup. Release the keys when you see a gray screen with a spinning dial.
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Select your boot volume if not already selected.
Select your username from the menu labeled Select the user account if not already selected.
Follow the prompts to reset the password. It's safest to choose a password that includes only the characters a-z, A-Z, and 0-9.
Select  ▹ Restart from the menu bar.
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Hello everyone,
as the title says, the integrated webcam of my Toshiba Satellite P300D-110 is not functioning properly. Allow me to explain. Using the Camera Assistance Software I can take photo's and record music. If I try to record a video the preview screen turns up black and the end result tuns out black aswell, completely black.
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