IMac Intel 21.5″ EMC 2805 Looping chime on booting

boothard driveimacssd

I am in trouble with my imac. Let me tell our story;

My imac was too slow and I decided to change HDD with a SSD. If I just be changed HDD, There was no problem. But I want to clone my HDD to SSD hard drive.

  • I cloned my HDD to SSD with follow this video. I used Carbon Copy Cloner app for clone, and I did something with Multibeast like in video(I guess problem start this point, I wish I had not Multibeast).
  • I changed HDD like this link
  • Open my Imac and came a boot screen I never seen ago;
    screen
  • I choose one but screen freezed, I waited for hours but there was no progress.
  • And I close Imac use power button.
  • Now my Imac looping chime on booting like this macbook

Notes:

  • If I unplug Screen cable, Chime sound come only one and fan running.
  • I try thunderbolt output for display but not working.
  • I try PRAM reset not working, I removed PRAM battery even but not working.
  • I try reinstall macos with USB or direcly with HDD but not working.

I think Multibeast corrupted EFI Flash So I learned Multibeast using for Hackintosh after this incident.

How can I fix my Imac? If problem about with EFI Flash, How can I reinstall EFI on rom.

Thanks in advance

Best Answer

I finally fixed my imac. Here is steps:

  1. I bought a new EFI chip from https://macunlocks.com/
  2. I changed chip on mainboard my imac. chip on board
  3. Finally my mac was opened but lanuage was chinese and ask me efi password(new chip has no efi pass.)
  4. Reset PRAM with CMD + Alt + P + R how to reset PRAM
  5. Fixed! Imac living after 2 months later.

I founded solution and similar situation from here.

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