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This is usually an issue with the Firmware, so I would first like you to do this please.
Remove the charger from the Kindle and hold the power button to off for 35 seconds.
Release, then connect the charger and try to turn on the Kindle and access the store
Let me know the results please
what exactly do you now see on the Kindle?
From Home, press the Menu button, and then select Settings. You will see the current software version at the bottom of the screen.
Tell me what the version is please
Can you give me its serial number please, will also be there
no, thats the firmware version, I need the serial please
Starts with B00
You will need to update it, to do this, go to this link
You have the Kindle Keyboard 3G (Free 3G + Wi-Fi)
You need to start on the step
And follow the steps to update the Kindle which you do via your computer
The instructions on how to do this you see here
You need to repeat the updates till your at the top of that list Software Update 3.4.2.
Once done it can access the store again
Let me know how you go please.