O.P. RE: Unable to power on the PC after adding 2nd hard drive
Thanks everyone for their replies.
Let me say that:
1) The power supply is the original that came with my system, it has the specs necessary to support a 2nd internal drive.
2) The "open,install,close" cycles should only affect two things: the IDE cable (that's why I tried with a new one) or the power connector. The power connector is supplying the right voltage since I tested it with the main drive and works fine.
3) My system does not support cloning over USB, and even if I were able to do it it would take ages to transfer 160Gb of data.
4) Both hard drives are set to CS, but jumper settings have nothing to do with this issue, the system should still be able to power on.
I tried a Y-splitter to the known good connector and no luck, still same problem. What I mean by not powering is that when I push the power button the PC does not turn on at all, as if it were unplugged from the power outlet. This happens only when two internal hard drives are installed. When only one main drive is installed (no 2nd drive) the PC starts normally.
I'm more and more convinced that it's the power supply.