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Please HELP!! My iMac 27" won’t boot up. This is what I’ve done in hope to repair it. Try to boot from my install disk, nothing. Try using a bootable USB with the OS X installed, nothig. Did however boot using target disk from my macbook. Using my macbook I erased the entire hard drive and installed a new OS X 10.6 still, but it all finish and restarted, nothing. I did also reset the SMC, the PRAM, force start using the key X, nothing. However if I use startup disk, using the firewire and select the hard drive from my iMac(won’t boot) from my macbook it will boot up, but from my tiny macbook screen. Please help!!!

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.

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?

Already did, nothing.

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!

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!

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