Re: Harddrive won't boot, should I put it on a working computer?
If you add a second HD it must be set as slave and the primary as master using the jumpers. Otherwise you may not get it to boot at all. The HD from computer A will most likely not boot in computer B anyway unless the mobo and other hardware is nearly identical. My suggestion would be to set the drive in computer B to master, the one from computer A to slave, then boot the computer and see if you can read the data form it.
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If your equation requires either a complex combination of variables to get the desired result OR you can't seem to get the result regardless of the variables....it ain't your variables, it's your constant.