2 Replies Latest reply: Mar 19, 2013 11:48 PM by jstand6
jstand6 Level 1 (0 points)

I have an early 2008 iMac with a bad display. The cost to replace the display is unreasonable ($600-$800), so I want to get rid of the computer now. However, I want to securely erase the hard drive first. I have an external display plugged into the mini-DVI port. It works fine when the full OS (Mountain Lion) is running. I initially used Cmd-F1 to mirror the main display.


I boot the computer from a Snow Leopard DVD so I can run Disk Utility to erase the boot disk. It seems to load properly to what should be the initial Install OS X screen. The problem is that the computer is attempting to show that on the built-in display, which is completely unusable (just a bunch of faded vertical lines). The external display shows the Snow Leopard background. I can mouse over to it, so it is in extended display mode. I need to mirror the displays to be able to see the menu bar so I can get to Disk Utility. The major problem is that the switch/mirror display keyboard shortcut (Cmd-F1) doesn't work here!


Does anyone have any suggestion? Thanks!

  • jstand6 Level 1 (0 points)

    I think I will be able to do this using Firewire Target Disk Mode plugged into our other iMac. Of course, I don't have a 9-pin to 9-pin cable. I ordered one on Amazon so it should be here in a few days, and I can give this a try. I hope it works!

  • jstand6 Level 1 (0 points)

    I received the Firewire cable today. Using Firewire Target Disk Mode worked. I am performing the very long secure erase right now... only 20 more hours to go.