HELP! my mac has logged me out and now asking for a name and password?

I was logged on shopping on top-shop online and suddenly the mac shut down.
It seems it has reset its self! My icon has disappeared and its now asking for a name and password.
i have tried my log in but it is not working.
Is there another way to reset the password?
can i reset it to log back in what can i do?
I have rebooted the computer several times but i dont know what to do!

First, make sure caps lock is not on.
Another reason why your password might not be recognized is that the keyboard layout (input source) has been switched without your realizing it. At the login screen, you can cycle through the available layouts by pressing the key combination command-space or command-option-space. See this support article.
If the user account is associated with an Apple ID, and you know the Apple ID password, then maybe the Apple ID can be used to reset your user account password.
Otherwise*, start up in Recovery mode. When the OS X Utilities screen appears, select
Utilities ▹ Terminal
from the menu bar. In the window that opens, type this:
res
Press the tab key. The partial command you typed will automatically be completed to this:
resetpassword
Press return. A Reset Password window opens. Close the Terminal window to get it out of the way.
Select your startup volume ("Macintosh HD," unless you gave it a different name) 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.
You should now be able to log in with the new password, but your Keychain will be reset (empty.) If you've forgotten the Keychain password (which is ordinarily the same as your login password), there's no way to recover it.
*Note: If you've activated FileVault, this procedure doesn't apply. Follow instead these instructions.

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Message was edited by: Ernie Stamper

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~~~~~~~~~~~~~~~~~~~~~~~~~
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http://tabletcrunch.com/2012/10/27/fix-ios-6-wifi-problems-ssid/
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http://www.youtube.com/watch?v=XsWS4ha-dn0
Apple's iOS 6 Wi-Fi problems
http://www.zdnet.com/apples-ios-6-wi-fi-problems-linger-on-7000004799/
~~~~~~~~~~~~~~~~~~~~~~~
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iOS: Connecting to the Internet http://support.apple.com/kb/HT1695
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http://osxdaily.com/2012/03/21/fix-new-ipad-3-wi-fi-reception-problems/
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How To Fix iPhone, iPad, iPod Touch Wi-Fi Connectivity Issue http://tinyurl.com/7nvxbmz
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https://discussions.apple.com/thread/4010130
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~~~~~~~~~~~~~~~
If any of the above solutions work, please post back what solved your problem. It will help others with the same problem.
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