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Firmware update incomplete - now no video!

by sad05 / October 21, 2009 1:41 PM PDT

A friend brought me their flat panel iMac after a firmware update went wrong. They said the instructions were to hold down the power button until the status bar appeared, which they said they did. But now the iMac displays absolutely no video.

I can hear the startup chime, I can hear the hard drive churning along like a champ, but absolutely no video! I tried rebooting the iMac with an original Leopard disk - nothing. I'm now in the process of reinstalling Leopard via target disk mode but something tells me that isn't going to solve the problem either! Because as strange as it seems there was no video in target disk mode either. Just a black screen and the white light to tell me the unit is powered on.

My questions:
1) Is it possible to fix this firmware update?
2) Can the firmware be overwritten or rolled back?
3) Can any of this be done via target disk mode?

Any help would be greatly appreciated!

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by sad05 / October 22, 2009 1:43 AM PDT

Update: I found the link to create the firmware restoration CD on Apple's website. I created the CD and inserted following the instructions but with no display to tell me what the Mac is doing (is it working?) I'm don't think it worked.

I can see all of the files via target disk mode but nothing I can think of to do will bring back the video.

Model: early 2006 17" iMac


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Does that iMac have a video output?
by mrmacfixit Forum moderator / October 22, 2009 2:50 AM PDT
In reply to: additional

If so, you could connect an external monitor to it and see if that works for you. (probably not though)
you could try to VNC (Remote Access) into it from the other machine using an ethernet cable


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