I have PC that functions perfectly well.
I have another PC also functioning perfectly well with an IDE disk that I want to move into the first PC.
When I try to move the disk and connect a power source in the first PC to this IDE disk then the PC powers down!
This is not a power capacity problem, I have a good 400W supply and the PC still cuts out if every other peripheral is disconnected.
This is not a configuration problem, I am not plugging in the controller cable (yet).
The disk still works fine if I put it back into the second PC.
Disk is an 80GB Maxtor, Gigabyte AMD motherboard on the problem PC.