Black Login Screen after installing updates 12.04

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http://askubuntu.com – I love my lixux 12.04..till yesterday it installed new updates and i clicked on restart.. As system went to grub all normal & loaded normal..then instead of pretty desktop (auto login turned on) i have black screen asking for login and password.. Why? How i get my desktop back to before? Please help new noob!!! This is due to updates i am sure, nothing in hardware has changed and no other display settings changed.. using AMD diver from there site linux one for my raedeon 6850 and have catalyst driver working fine.. i have tried typing in weird commands but they didnt do much like sudo (HowTos)