On Oct 16, 2008, at 4:02 PM, Simon Royal wrote:

> The internal DVD drive was also playing up and it wouldn't pick up  
> the disc.

Wow. A lot is issues. HD not working. Optical drives not working.  
(note, this is two separate busses, SATA and ATA). You sure the power  
supply was good? Probably not, since you said "The DC board looks a  
bit burnt." Intel iMac's have a DC board? This means external power  
brick, like the Mini? (I should know, I've worked on a few Intel  
iMacs, but I can't remember).

> I have a DVD drive in a firewire case but AHT discs will only boot  
> in Apple specified drives.

I don't buy this. A bootable device should be a bootable device. The  
disc can't specify which devices it will or won't boot from. It's a  
chicken & egg type problem. The disc, which is dumb can't sense the  
boot device without being booted first. Hence, it must boot in order  
to know what the device is. I've got several AHT (Apple Hardware Test)  
discs and ASD (Apple Service Diagnostic) discs. They always boot from  
externals for me, it's just that they won't run on a wrong machine. I  
suspect your external ports were also not working on this severely  
broken iMac? I believe AHT & ASD should boot from any bootable device.




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