I am not sure if this still work in HS, but you can try
1) Hold Command + R during boot to enter Recovery Partition
2) Open Terminal
4) Select an account available (whatever the name is) and give it a new password
And now, you should able to login with the "new" user name and password.
I can get in, don't have back upCan you get in as any User? Do you have a backup?
Thank you. How do I open the terminal? That option dint show up when I rebooted un safe mode
I can get in, don't have back up
I reseted the password but it didn't work. Again I could get into the system but when I need to do something with the administrator permission, it doesn't recognize the administrators name.Yeah, in general, it's much easier (and safer) to open a new admin account, move everything to there, and then delete the old one.
Thank you... but they don't even have a number to call from my country :/ If you happen to know how can I contact them, it would be great...Trying to change the Admin name always causes this problem. An Apple support call talked me through recovery which took approx 30 minutes and was fairly complicated involving a number of command entries during recovery after rebooting to boot into safe mode to reset my Admin rights. Suggest you call them.
Thank you for the advice, its really appreciated.Member "Marc_S" gave you some good advice above. I strongly recommend you do as he suggests. I've been thru this before with other users and I can tell you that recovering from this is not easy. Creating a new Admin account also has its pitfalls, so be careful.