I bought a book today through my amazon account. I waited for it to download to my Kindle HD but it didn't. I went to my account to try and manually download it but I am unable to sign onto my account? I can view any page except the "manage my kindle" page? When I try to re-log in, it shows the log in screen but when I enter my information and click on the log in tab, nothing happens? It just sits there like I never clicked on the button???? HELP!