PC does not boot up with extra harddisk

I added a harddisk from a PC with a failed motherboard to a second PC that works fine.
However, as soon as I add the disk from the first PC to the second, the second will not work: the power light turns on and that's it, no fans, no disks.
I tried just about any combination between both IDE cables and master, slave and cable select combinations. What it boils down to is that the second PC will not start with the harddisk from the first.

What is the combination that should work or what else might be the problem?
Combinations I tried are (among others):
- added disk as master on secondary IDE
- added disk as slave the primary IDE
- placed disk as only disk (master on primary IDE)
I tried both with and without the DVD-Rom on the secondary IDE.
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It sounds like it's shorting the 12 volt line, because that lines feeds the fans and the HD's

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