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To factory reset an iMac without a login or keyboard, you can try the following steps:
Boot the iMac in Target Disk Mode: Connect the iMac to another Mac using a Thunderbolt cable. Power on the iMac while holding down the T key. The iMac should appear as an external disk on the other Mac.
Reinstall macOS: Open the Disk Utility app on the other Mac and select the iMac disk. Choose "Erase" and follow the on-screen instructions to erase the iMac's drive. After erasing, quit Disk Utility and follow the on-screen instructions to reinstall macOS.
Restore from Time Machine Backup: If you have a Time Machine backup of the iMac, you can restore the backup to the iMac after reinstalling macOS.
If these steps don't work, you may need to seek assistance from an Apple Store or a professional repair service.
I have to assume that you mean you REPLACED the hard drive, as there is no room for two drives in an iMac.
If I had this machine in my shop, I would start by resetting the SMU (there are several models of iMac G5, each with a different procedure) and then resetting the PRAM at boot by holding down command-option-P-R until I got the boot chime three times. Then I would boot it from an external OS drive and run DiskWarrior over the internal drive to straighten out any file system corruption. Or, if the drive is brand new, I would erase and format it with "write zeroes to all records once" just to verify the drive and map out any bad blocks.
Then I would try the installation again. When the machine rebooted, I would hold down command-V as I heard the boot chime, just to watch the console messages in real time and see what appears at the point of hang, assuming it continues to hang. From that point, I would be able to diagnose more about where to look for the problem.
Thanks for the detailed report by the way. I apologize if my plan of action involves a lot of accessories you don't own, but the fact is you don't have a trivial problem to diagnose here.
look at the browser tools at the options ..under security ..or interdictions ...Im not sure at Mac ...it is for sure added by mistake on the list with blocked sites..
That sounds like it would fix it. Have you recently updated the memory in the imac? It may be incompatable. Otherwise it may simply have become faulty over time.
Please make sure that before you open up your imac, you're not voiding your warrenty. I know that the aluminium imacs allow this, but i dont think the G4 versions do.
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