ALL 32 units turn on and boot to Mac os 10.7.3 Lion operating system. These came from local schools, so when you power them on, a blank page comes on asking you to type user name and passwords. I have both of them and after I typed, it took me straight to desktop. I was not able to change date & time due to system preference password. see picture. I have not done any other testing. Majority of them have full keyboard keys but few are missing some keys. Physically they are in good shape with some scratches, scuffs & sticker residue. I will try to clean them off as much as possible before shipping.