The iPad is another of Apple's revolutionary products, which effectively changed the entire landscape of tablet-style computers when it was released to the public.
The built-in way to get eBooks for your iPad is through iBooks and iTunes. iBooks is an app that you can use for the iPad or the iPhone. You can buy eBooks in iTunes or the iBookstore and download to your iPad from there.
Bluefire Reader for iPad
Bluefire Reader is an excellent app to use if you don't want to get eBooks through iBooks or Apple's channels. Bluefire Reader will let you read DRM'd Adobe eBooks, both PDF and ePub formats. That is very useful because most book publishers are now making their eBooks available in those formats.
And if your iPad has a problem, you can contact iPad Reparatie Utrecht and have your iPad 3 or iPad 4 fixed.
If you have ebooks in .pdb format that you want to read on your iPad, you can use Lexcycle's Stanza app. They have instructions for setting up Stanza Desktop and using it in a specific way that will allow you to transfer .pdb ebooks to your iOS device. There is community support for Stanza at getsatisfaction.com/stanza
eBooks for Devices -- Palm, Sony Reader, Nook, COOL-ER, iPad, Windows Mobile, iPhone, Blackberry, and more.