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<blockquote data-quote="WebLOCH" data-source="post: 411802" data-attributes="member: 30404">Okay well I have disassembled the imac with dysfunctional usb, a comparison of the board to another board shows nothing particularly unique, the solder contacts seem to be fine, although I may attempt to apply a little heat to make sure.I have also ordered a firewire to usb cable to see if that will allow me to get at least a keyboard running, then I can try the hardware test.&nbsp; No joy as far as target disc mode, it works, the only thing it checks remotely is the harddisk, which seems to be in fine condition.&nbsp; So for future reference, you cannot boot from one mac to diagnose another via the hardware test in this manner.Any other suggestions welcome... here's the statusNone of the 3 USB ports works, but all will light the apple mouse optical laser up.&nbsp; Suggests power is available... could the controller be dead?&nbsp; Where would I find it?</blockquote>

[QUOTE="WebLOCH, post: 411802, member: 30404"] Okay well I have disassembled the imac with dysfunctional usb, a comparison of the board to another board shows nothing particularly unique, the solder contacts seem to be fine, although I may attempt to apply a little heat to make sure. I have also ordered a firewire to usb cable to see if that will allow me to get at least a keyboard running, then I can try the hardware test. No joy as far as target disc mode, it works, the only thing it checks remotely is the harddisk, which seems to be in fine condition. So for future reference, you cannot boot from one mac to diagnose another via the hardware test in this manner. Any other suggestions welcome... here's the status None of the 3 USB ports works, but all will light the apple mouse optical laser up. Suggests power is available... could the controller be dead? Where would I find it? [/QUOTE]

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