Cannot login after Lion Update

I'm getting the exact same thing, except I don't have a second username and therefore can't login at all. Good times.

I was talking to Apple this morning but didn't have time to finish. I will be calling them later. I'll let you know how it goes. Who knows? Maybe Steve will have pity on us and hook us up with new Mac Pros or something. 🙂

From MacRumors Forums. Sounds like a similar-enough issue to give this a try (http://forums.macrumors.com/showthread.php?t=1191239):

I got the answer here

Ok step 1

Boot your mac with Option + R holding it will boot into recovery mode

Step 2 go into disk util and take terminal

write resetpassword

Choose root and put a password to log on root

Reboot the mac and log in as root and root password that you've done

Go in System Preference then users and group

Create a new account with the SAME NAME and SAME PASSWORD as your old account and put it as an administrator

When you accept it will say that in MacHD you already have an account with the same name do you want to use THAT folder

You say YES it will take 3 mnutes about.

Then log off and your account will be there, select it and put the password

It will log and all your files will be there.

That is what i done and it worked, my desktop docs and itunes is all there

And for the time i took

They refunded my Lion purchase and will send me a 50$ itunes store card 😝

Gotta love it hehe

Sorry for the bad english

Message was edited by: michaelfromeagle

Another link. This one is about the Developer Previews and the only systems it affected were ones with an nVidia GPU. I'm not sure which kind I have.

http://www.displaylink.org/forum/archive/index.php/t-844.html

Had the exact same problem, the only way I fixed it was to autologin for the primary. You could try a fresh install of Lion, via USB or DVD route of the installer.

This was exactly my problem too, after upgrading to Lion. I originally solved it by booting in recovery mode, renaming my library folder (not deleting so as to keep backup of all prefences and app data) and logging back in. Followed by 4-5 hours reconstructing my account, from the Library backup. Even then, only about 80% of original account config, but at least I was up and running. For about 1 month...

This morning I restarted (not for the first time, since restoring my account) and guess what... yes AGAIN! To say I'm angry is an understatement.

Same symptoms as noted by jrosenblum. I can ssh, but otherwise always grey for a couple of secs, before switching back to login screen. The suggested solution I'd already tried. That is for when lion has "lost" your account. In our case, the account is there, as proved by ssh. Hence you can't even do the above mentioned, osx won't let you because the "account name already exists". It's IMPOSSIBLE to enter SAME NAME / PASSWORD.

In contrast to jrosenblum what I see in the console is a loginwindow crash. Every time. And always KERN_INVALID_ADDRESS at 0x000000000000001c

Googling that confirms my suspicion it's a driver problem but hasn't helped much beyond that. Most perplexing is that I can't even log in in safe mode.

Nailed it!!! (for me at least)

A couple of work colleagues have had the same problem; it turned out to be a wonky keychain! Man, man, man!!!

Solution was to rename the old Keychains folder, then I could login in. That was all! Then from KC Assitant open the old keychain, set it as default, and delete the new empty one created at log in. All my passwords and certs and keys restored.

Maybe because I often run a developmennt script for building apps, which adds and removes a keychain. Something must have got screwed up. Would explain why 3 of us here at work have had the problem, which otherwise doesn't seem to be too common.

Nevertheless... SL never had this difficulty. I don't like Lion.