OS X Mountain lion download issues

Hi, I just purchased OS X Mountain Lion from the app store.
The download started ok, then my internet connection dropped (which is the issue I am trying to sove for as all my other Apple devices are fine and dandy when it comes to wifi connection except my iMac on OS X 10.7.5) and the download icon dissapeared from launchpad.
I went back to the app store, downloaded it again and now it's permanently stuck "waiting" even with the wifi on.
Any tips/tricks for making this download actually happen? Thanks in advance for any help.

This has worked for some.
- Sign out of the App Store (in the Store menu)
- Quit the App Store
- In Finder - Go>Go to folder...  (or Apple-shift-G)
- Paste in the following "~/Library/Caches/ "
- It will take you to a folder.  Delete com.apple.appstore
- Launch the App Store.  Sign in and then reclick the Mountain Lion buy.  It won't charge you again.

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