I thought about that, too, Rudder, but from his other posts it appeared that Win2K was on Drive C: on his normal computer, with Windows ME on Drive D:. Assuming he hooked it up on the second computer as Drive C: (normal boot drive), I don't see why booting would fail, unless it's because boot.ini still shows the additional partition that isn't there and causes a fail. I haven't found any support documents that reflect that possibility as yet, though. In other words, if he always had win2k on drive c: and just switched the drive to another computer as drive c: there, I don't see the boot fail issue occuring. However, if it is happening later in the hardware detect sequence, then that is certainly plausible because of different peripherals and motherboard. The NTLDR missing error is usually the first thing that will kick in, though, so I would suspect elsewhere.
In the end, I think the fact that the hardware is different on the second pc will cause no end of problems even if it did boot successfully.