My kindle is jamming all the time then repeatidly trying to reboot what happens to all my books purchased if i have to go and buy a new one

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How do I cancel an order for a kindle book - Amazon Kindle

very simply, you access the Kindle devices "Settings" page and in the section that says register/deregister, you would click on the deregister option, once the device is online with the built-in wireless network connection. After which, the device is ready to be registered to a new account.
Please be aware that just changing the devices account registration does NOT delete any content; also changing registration does not provide the new owner the legal access to the books already downloaded to your Kindle, the original account that purchased the books, will retain ownership.
There is no way to give your purchased book library to the new owner of your old Kindle. If the new owner likes the books, then they will have to buy them on their own, to retain future downloading rights.

Two methods.
First: A computer is required. Connect the old Kindle to the computer it should show up as a new drive. Open that drive and find the books. Transfer them to the computer. Plug in new Kindle and do the same only transfer the transferred books from the computer onto the new Kindle.
Two: If you purchased the books from sources like Amazon, your books are saved on their cloud. Simply connect your new device and download all your books again.

I've had that happen a few times and it turned out to be nothing more than some problem with the Kindle Store itself. Try waiting an hour or two and trying again.

Books you buy should be listed in your Amazon Kindle library.
Check it using a laptop or desktop.

If they aren't listed there then something went wrong with your order.

If they are listed in your Kindle library, you need to turn on your Kindle and connect it to wi-fi or 3G. Your Kindle should then automatically download the new books. If it doesn't, touch Settings and select *Sync and check for new items*. Make sure the Kindle you want to download the books to is listed as your default Kindle if you have more than one so new books will automatically download to it once it's connected.

contact Customer Support. They must be able to help you.

Try rebooting your Kindle by holding the 'on' switch down for 20 seconds then letting go - it should 'reboot' by itself. You may have to do it a couple of times to reset your Kindle.

If this doesn't work, contact Amazon Customer Service as this is a common problem.

Unfortunately not - books for Kindle must be bought seperately