iMac won't boot!

Logsi

Logsi

Logsi

Soldato
Joined
19 Oct 2005
Posts
10,500
Location
Kernow
My iMac has been a little flakey since last year. It would struggle to boot and lose the boot up hard drive. I would just leave it and come back to it and it would work again.

Now, it's stuck in an endless boot cycle but shows some text on the grey screen when booting. I've no idea what any of this means and googling doesn't help either!

Can anyone decipher these messages? Apple Support are shut today also...

NcVvP1T.jpg


It won't even boot up from a USB recovery disk or safe mode. I think it's something to do with the fusion drive, not sure i'd get one of these next time...

EDIT - Tried booting into my Windows 8 USB 3 drive and fails also, the standard "You PC ran into an Error" message.
 
Last edited:
Remove the ram, blow out any dust etc in the slot and reseat it, if you have upgraded the ram, try using the original stuff and see if its boots up.
 
Clov!s said:
Remove the ram, blow out any dust etc in the slot and reseat it, if you have upgraded the ram, try using the original stuff and see if its boots up.
Click to expand...

Done that, usually the first thing i do when a mac has issues.

I think i sold the original RAM but i took all sticks out and left a single stick in and still didn't work.

Googling the error doesn't come up with anything but i think the errors point towards a fusion drive failure. "Compositedisk", "Corestorage", etc...

bt_replace_range failed doesn't bring up anything either.
 
I've tried booting from my external windows drive and that fails too.

Starts to load up on the Windows boot screen then goes to a "PC Ran into a problem. Rebooting" screen.
 
It needs to be formatted with Mac os and have guid partition scheme to be able to boot.

There's a few guides online for it.
 
Try reseting the PRAM.

Unplug from the wall.
Press and hold power button (back of the screen) for 10 seconds.
Put plug back in and power on again.
 
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