1 
3 iMac won't boot, 5 red lines appear on grey screen
Does this just mean I need a new graphics card?
Most recently I've tried internet recovery and it's been stuck on 24:00 minutes remaining with no progress for an hour now. I've also tried the following:
SMC reset. Shut down and unplug all cables including power cord for at least 30 seconds and then plug in power cord and keyboard/mouse.
PRAM reset. Hold down option, command, P and R while booting. Start it when you hear the sound and don't let go before it reboots.
Safe boot. Hold down shift while booting to boot into safe mode. If this works, open Disk Utility from Utilities and repair your permissions and verify the disk
Boot from another Mac (Thundebolt target disk mode). Connect the machines with a Thunderbolt cable. Power on your Mac and press T. Select the other Mac's hard drive. Download the current OS X combo update. Run the combo update installer and select the drive that won't boot as the destination.
Esta é uma boa pergunta?
971 
2 comentários
I'm confused here... Safe boot works, yet running in target mode doesn't (just the system alone). As for connecting via Thunderbolt cable some early systems had issues connecting in target mode so I wouldn't put to much on it working. Try FireWire if you can or via Ethernet. Can you access the HD that way?
por Dan
Apologies, running in Target Mode does work.
por Scott