Mac AppStore won't even start today!

I was a happy user of mac appstore. I did not use it often, but from time to time. May be once a week.
If I click the icon to start it, it bounces for a while, and then stop bouncing. That's all it does. See the video below.
http://screencast.com/t/X2owFG3660Q
Is there a solution for this?
Can anyone explain why this is happening?

Hi,
Quit the Mac App Store if it's open. From the menu bar App Store / Quit App Store. Or Command + Q on your keyboard.
Launch iTunes then from the iTunes menu bar click iTunes / Preferences then select the Advanced tab.




Click: Reset warnings and Reset cache.



 Now from the iTunes menu bar click Store / Sign Out.


Try the Mac App Store.


If you still have problems, follow the paths here. 

~ (Tilde) represents your Home folder.
~/Library/Caches/com.apple.appstore/Cache.db. Move the Cache.db file to the Trash.


~/Library/Preferences. Move the com.apple.appstore.plist and com.apple.storeagent.plist files to the Trash.


~/Library/Cookies. Move the com.apple.appstore.plist and Cookies.plist files to the Trash.


Restart your Mac. Try the MAS.
If nothing has helped reinstall the MAS by downloading and installing the v10.6.6 combo update available here.
http://support.apple.com/kb/dl1349
Carolyn
Message was edited by: Carolyn Samit

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