You had Evaluation copy of Windows 2000 on your PC.
that copy was expired.
you installed full (or upgrade) licensed Windows 2000 on you target PC insead of evaluation copy.
then you have no windows display now.
(you can see Boot screen but you cannot see windows splash screen and others)
Am I understand right?
here is Windows 2000 Evaluation Copy Expiration Behavior Info. from microsoft
how did you install your lisences windows 2000?
do you have Winodws 2000 CD with you?
can you boot from your windows 2000 cd?