RedWarrior wrote:
and I've definitely done this on a PC previously- it didn't boot, so I turned the cable around.... no problem. why should it burn out?
A PC 3.5" hard drive only has 40-pins, and it's cable doesn't carry the power for the drives logic and motor on it. So you can get the cable around the wrong way and be okay. However with a 2.5" drive, having no molex power connector like a 3.5" HD, the power is carried on cable via pins 41 to 43. (41 = 5v, 42 = 5v, 43 = GND) If you get the cable around the wrong way you're dumping the 5volts from 41 & 42 into pins 3 & 4. Which are data lines.
If the A600 still boots from floppy, like someone here suggested, connect your old HD, boot from floppy and use the HDToolBox to try and detect the HD.