Got an error while scanning documents using HP ScanJet

I just installed a new HP Scanner ScanJet 5400c and was testing it when I got this error message.

HP Precisionscan Pro
Sorry, scanner could not be initialized. (Scanner not found.)
I was able to get my own scanner since I had to scan documents a lot.
I was so happy with this versus sharing a networked scanner.
I could not go back in using the shared scanner so please help me resolve the issue.
Thanks a lot.
