My start up screen comes up blank and I can't access anything but system preferences. Can I reset my laptop. It's a MacBook air

Help my start up screen is a blank screen and the only thing I can access is systems preferences. How can I reset my laptop

Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, by a peripheral device, or by corruption of certain system caches.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode and log in to the account with the problem. Note: If FileVault is enabled on some models, or if a firmware password is set, or if the boot volume is a software RAID, you can’t do this. Ask for further instructions.
Safe mode is much slower to boot and run than normal, and some things won’t work at all, including sound output and Wi-Fi on certain iMacs. The next normal boot may also be somewhat slow.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin. Test while in safe mode. Same problem? After testing, reboot as usual (i.e., not in safe mode) and verify that you still have the problem. Post the results of the test.

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Note: Data will not be affected.

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Perform a Reset... Try again...
Reset ( No Data will be Lost )
Press and Hold the Sleep/Wake Button and the Home Button at the Same Time...
Wait for the Apple logo to Appear...
Usually takes about 15 - 20 Seconds... ( But can take Longer...)
Release the Buttons...

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It sounds like your iPhone 4 has a dim or blank black screen but responds to some commands like enabling vibrate. I understand this may be a frustrating situation, but the troubleshooting suggestions in the article below will help you solve the issue.
Get help with the screen on your iPhone, iPad, or iPod touch - Apple Support
If your screen is too dim, too bright, or you see only faint images
Try to adjust the brightness. If the screen doesn’t respond when you adjust the brightness, open several apps to make sure it’s not an issue with only one app.
If you have a screen protector, try removing it. Try removing your case if it includes a screen protector.
If you see the issue in multiple apps, restart your device.
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Take care,
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Try This...
Close All Open Apps... Sign Out of the Account... Perform a Reset...
Reset ( No Data will be Lost )
Press and hold the Sleep/Wake button and the Home button at the same time for at least ten seconds, until the Apple logo appears. Release the Buttons.
http://support.apple.com/kb/ht1430

My start up screen comes up blank and I can't access anything but system preferences. Can I reset my laptop. It's a MacBook air

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