Why does Google play show a "no connection: retry" error?
Okay, I ran into the same issue and finally found a fix that worked!

First off, go to settings>Applications>Manage Applications>Google Play Store and select "Clear Data"
Then, return to your home screen and just wait for the Play Store to auto-update.
If it does not come up on its own, re-open the store and select "update"
Finally, close the app (after it boots up), give your phone another minute,and have at it!

After trying this, my Play Store has been working just fine.
I hope that helps!

Cheers