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Model A1312 / Mid 2010 / 3.2 GHz Core i3 or 2.8 & 3.6 GHz Core i5 or 2.93 GHz Core i7, ID iMac11,3

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Having problem with reseting my administrator's password

I lost my administrators password of my iMac, I was away for almost 2 months and can't remember the password. Now I can't install anything!!

I did try and re-install OS X with my install disc but it always gets stuck right after the restart and option.

Did try with the USB also and nothing. When it's stuck the USB's activity light is off and the disc does not sound like it's turning.

Please help.

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Start up from your system installation and go to the second screen pull down menu. Pull down Utilities to Reset Password or Change Password, and clear it out.

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Thanks for the response, but.

It does nothing with the installation disk and/or a bootable USB. It just show the apple and does nothing.

Last night I try the target disk option and erase all my hard drive using my macbook and also installed the OS X the same way. It show that the installation was successful because it did ask me my name, new password, photo, administers password and all.

But when disconnecting the firewire and restarting the iMac, again it got stuck on the apple.

Please help.

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Reset the SMC, here's how:http://support.apple.com/kb/ht3964

Next reset the PRAM and NVRAM: http://support.apple.com/kb/ht1379

Next try staring up in Safe Mode by holding down the Shift key on start up. Please let us know your results

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Ok, first I did a reset for the SMC and then for the PRAM and NVRAM but the iMac did NOT start in any mode, safe, from the install disc, nor from the USB. Only in target mode from my Macbook. So this is what I did next:

Just finish erasing the hard drive using target disk with firewire and disk utilities. And installed OS X also using target disk and my Macbook, and it installs fine I can navigate the entire OS but ONLY from my Macbook using the firewire cable.

Now it will NOT boot by itself, nor using the install disc.

So I'm even deeper with my problem.

Please any suggestions??

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If you're using a gray machine specific disk for the MacBook, that system will not work on the iMac. Try using the install disk that came with the iMac or a retail version of 10.6. Do you have a retail 10.6 system installation disk?Have you changed the hard drive on the iMac?

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The first thing I used was the installation disk with the 10.6 system and it wont recognizes it.

When I used the "C" key option when restarted the iMac it won't do anything, when using the "option key it does give me the choice of what disk to use for start, but again it does nothing. So I used a USB and copy and mounted the installation disk to it, with the same results.

So I used my macbook and set up the iMac into target mode and then erase the hard drive (Zero Out) and then install a clean version of OS X using the USB. Still on my macbook, using the hard drive from my iMac I can browse everything, so I restarted the iMac using Start disk option on it and selecting the iMac's own hard drive, SAME RESULT.

Again using "option" key it does give me the choice of a start up disk but it wont boot up unless I select my macbook own hard drive and on my macbook selecting the iMac's hard rive.

Again thanks for the responses and I hope you can still help me because I'm loosing my mind. Thanks.

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此回答最初是针对另一个问题

I have the same issue right now, I've noticed that any keyboard I'm using is getting no power (The Cap Lock LED won't light up), so in theory holding the "C" button to boot from the CD drive is pointless. Any idea's?

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switch USB ports and/or try a different keyboard.

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此回答最初是针对另一个问题

Already did, nothing.

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此回答最初是针对另一个问题

Same problem right now here: my Intel iMac refuse to boot (after a 10.6 automatic update error). I tried all: it doesn't boot from any CD, it is always blocked after safe reboot, single user mode repairs and so one. I was even able to boot it as a target HD and do Disk Repairs from my laptop (having it as a external HD Fireware disk). Did smebody find a solution? Thanks!

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此回答最初是针对另一个问题

I had the same problem. Took it to the Genius Bar at Apple & a "genius" told me my logic board was dead. $654.00 to repair. He suggested I buy a new machine because my 4 year old one will be obsolete in a year! I'm very upset & haven't done anything yet. Good luck!

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Bonjour

J'ai un iMac Core tout 3, et lorsque vous voulez installer un nouveau mot de passe système Mac m'a demandé et je n'ai pas ce mot de passe.

Est-ce pour aider à résoudre ce problème, et je vous remercie.

Pour vous référer à démonter la machine et retirer la batterie une période de temps et puis après vous ré-assembler l'appareil, mais il est resté le même problème.

E-mail: Erriada_Informatique@yahoo.fr

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I bought a used imac all in one model a1312 was never given the administration password how do i reset password

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