I've had the same problem until I downgraded the kernel. Open Software Center and search for „kernel 3.7”. Remove everything related to this kernel and keep the old one instead. For me this did the trick.
-- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1084523 Title: Can't start Unity on Ubuntu 12.10 after kernel update to 3.7 in HP Pavilion dv6000 To manage notifications about this bug go to: https://bugs.launchpad.net/xorg-server/+bug/1084523/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp