The bus in question is the one the hard drive is attached to. It is labeled Ultra ATA, while the bus the optical drive is attached to is labeled IDE. Both are on the logic board. No extra PCI cards installed. Single drive only attached to the bus. The pci controller chip verifies this as a rev A board. If I attach a drive to the IDE channel, (slower secondary bus) the machine will boot from the drive.
The location in question (R110) does not have the smooth solder pads where no resistor is normally located, rather the solder is much higher with sharp faces where the resistor had sat between. If I can find out the value of the resistor I can remove a like one from another board and solder it in place. There will be no guarantee this will repair the board, but as it's a rev A board, there isn't much to lose!
James
James,
Explain "the Ultra ATA bus isn't showing up" please. Where isn't it showing - Apple System Profiler or???.
Are you using an Ultra ATA PCI controller card or attempting to add a second drive as master/slave?
The later is usually not supported on those Macs and can also lead to data corruption, and the drive would have to be 128GB or less in size.
BTW: Many Macs have missing resistor holes, so I wouldn't assume that adding one will get things working. ;)
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