2nd Hard Drive Needed for Boot

Good Morning,
We had an operating system crash on a windows 2000
Pro computer. I needed to backup files from the hard
drive so I installed the hard drive in a second working
computer on the secondary IDE channel with CS on the drive
Basically I just removed the CD Rom and temporarilly put
in the hard drive. I was able to back the files fine but
this is where it gets funky. The hard drive that I
installed Temporarilly on the 2nd channel became the C:
drive and the drive that was in the computer already was
switched to D: So now when I remove the temp hard drive,
and try booting the pc, it loads the operating system then
it gets to the login screen, I type in credentials and it
accpepts them and continues the process, it even maps a
persistant drive mapping for the user but then the process
just hangs and after approx. 2 minutes time the login
screen re-appears. Its in a loop and it just keeps doing
this. However if I put the second hard drive back in the
system the computer boots right up, but again the second
hard drive is the C: and the original (System) drive is
D: I didnt manually change anything for this to happen.
Since it happened I have tried to change IDE Channels,
change from CS to slave, I tried making the first hard
drive the master etc. probably every conceivable setup but
it doesnt change anything. What I would like is for it to
go back being a normal bootup with the single hard drive.
Any help would be greatly appreciate i.e registry
settings, ntldr etc anything. thank you
..

(Chris) wrote in message . com...
I installed the hard drive in a second working
computer on the secondary IDE channel with CS on the drive
Basically I just removed the CD Rom and temporarilly put
in the hard drive. snip

How does BIOS see the drive when you take out the 2nd drive - is it
showing up as HD 0?

Can you boot up in safe mode? Have you tried repairing the existing
W2k install from the recovery console?

You didn't accidentally switch the motherboard connectors?

Do you get a choice of what OS to load at bootup? Do you see two
instances of W2K? You might need to modify boot.ini.