If it’s a software problem then booting from an external drive will usually work. Of course, I also have a wired keyboard available if that doesn’t work for some reason.īesides using another Mac to boot an unresponsive system in Target Disk Mode, a viable system on an external drive can work as well. If the light on the keyboard is green when the chime sounds the computer will usually recognize it. To deal with this I press the power button on the keyboard just after starting up the iMac and before the boot chime sounds. This appears to be, in some cases, because the keyboard is asleep and not sending a signal to the computer. I’ve noticed that my iMac will sometimes not recognize special boot modes from the Apple wireless keyboard.
Osx target disk mode how to#
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Osx target disk mode full#
Once the drive is unlocked and mounted, you should have full and unrestricted access to all files on it. If your Mac is able to get into Target Disk mode, then it will show up on the second Mac as an external hard drive, and only require you supply a password if FileVault encryption was enabled on the faulty Mac. In these cases, you will need to take your Mac in for servicing.
If your Mac is still not able to get into Target Disk mode, then you either have a firmware password set on your system to in part lock out special boot modes, or your Mac is experiencing enough faults that Target Disk mode cannot be accessed. Therefore, if you are having trouble getting your system into Target Disk mode, then try using a USB keyboard and holding the T key from the point you power on your Mac. This means that for wireless keyboards, you may have trouble activating Target Disk Mode as you will have to press and hold the T key immediately when the boot chimes sound, as opposed to before. This window of opportunity is immediately when the system’s boot chimes sound, which is also when the controllers for bluetooth keyboards are activated. Special boot modes on Macs require the system capture the keys being pressed before the firmware passes control to the operating system.
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