CPU company? Like AMD, eh?

Anyway, this Azureus screeny shows that it's a major problem. (p)ATA drives aren't exactly designed for hotplugging. It won't be a software issue, that's most improbable. So it's the hardware, either the drive, the cable or the controller.
You may try to :
1. use the cables from that PIII, as the HDD worked flawlessly over there. Or get new cables. But be sure they're not too long, the ATA specification allows no more than 48 cm, IIRC.
2. the mainboard in your comp should have two IDE plugs, primary and secondary. Switch the HDD to the other and give it a try.
3. go into your computer's BIOS and reduce speed for the harddisk, i.e. the PIO or ATA-mode, or whatever it is called. Not very likely working, but worth a try, as the PIII is probably running at lower speed.
Good luck. BTW, what kind of mainboard is it you're using? And : is your machine overclocked?