You made the mistake of migrating the Guest account from the old system. That always causes problems. The best option would be to start over by erasing the startup volume in Recovery, reinstalling OS X, and then transferring the data again in Setup Assistant (not including the guest account.)
If you don't want to do that, see below.
Whew, lots of info and very little experience on my end! And also, thank you so much for the reply!
I was gifted the new machine as a hand-me-down with mavericks installed. I have no way to re-install the OS.
I tried the CMD+R trick, but all I got was a blank screen with one window offering four options. None of them were "utilites" with any options for "terminal". The closest one was "disk utility" which seemed to be about wiping the hard drive?
I looked at the Apple ID option. I actually have no idea if the user account that migrated from the old computer had an apple ID, but I think it did. I wasn't given the option of using this no matter how many "incorrect" passwords I tried. The instructions said
"Note: In some cases, you may not be presented with the opportunity to reset the password after three incorrect attempts. If this happens, open Users & Groups preferences, remove the affected Apple ID, and then add the same Apple ID back."
I don't know how to open any preferences when I can't get past the log in screen.
I should clarify that I know the password to the user account that migrated from the old machine, and it still works on the old machine, but the new machine won't accept it. During the migration there was an option to replace the new user account I'd set up on the new machine with the old account from the old machine and I agreed to that. I don't recall any options about guest accounts and I don't think the old machine had any guest accounts actually set up on it so that's a mystery to me.
I hope this is making some sense, and I'm sorry to be so lost with all of this!
I think erasing the hard drive and re-installing the OS is what my brother in law already did (he's since left for another state), then he downloaded maverick. I have no idea what software the machine shipped with, but hopefully he can tell me. It has no disk drive, so installing that way is out. I can't bring up the machine info at this point, obviously, but I think it had 4 gig of memory so that should be fine.
So, it sounds like the next thing I need to do is find out what software it shipped with. What you're describing about the internet recovery mode sounds somewhat similar to what I encountered, but I'll wait to try again until I know for sure what the software situation is.
Thanks so much for the help, I'll report back when I get further!
I'm not sure what year the machine is, so I'm not sure of the original OS. I tried to work it out from the location of the serial # (which I will need if I have to get replacement discs anyway, I assume), but the markings on the back don't really correspond with anything here: www.http://support.apple.com/kb/HT1941 so I'm not able to identify the serial #. Obviously, the "about this mac" option is out. Not sure if I can assume that the copyright date (2010) is the date of the computer. I'm a bit leery of making assumptions at this point, I'm already in enough trouble!
perhaps you can help me too.
Bought a mac air - there is no disk with it. Worked fine, with my simple lock screen password. Then I changed password for my ID in iClaud. When I went to open my computer again, my previous screen lock password was not accepted (is the screen password the same on as in the iClaud, iTune, etc?)
Then i tried to put in the new iClaud password but it does not accept either.
So I am stack. I tried to reboot with command + S or R but nothing happens. I cannot switch it off beacuse it ask for the administrator ID (who is the administrator?) + a password. Again would the administrator password be the same as in the iClaud or is a different one?
tahnks if you can help
I could not see how to start a new question, so forgive me for "interrupting" with a similar but different problem.
I have a 2011 MacBook Air, OS X 10.7.5 and have been very happy with it. Suddenly, though, when trying to approve installation of an Adobe update, I typed in my Admin password and it was rejected. I was given a hint, which fit the password I was inserting. I made sure caps lock was off and that I was using the correct keyboard. I never got a message saying use Apple ID to access this computer. It was continually rejected.
Then I tried the Users&Groups method to get in, but my only options there are Change Password (which I can't do because it doesn't take the password) or Change my Apple ID, open Address Book Card or Parental Controls.