Fan noise after HD Upgrade

Hello:
I have a 12" 1 Ghz G4 Powerbok in which I have repalced a failing HDD, one 60 Gbyte drive for another. Once I've put it back together again I have a steady fan noise. Always on - from power-up, before the chime, to shutdown, except when sleeping.
I have no spare parts left over after re-assembly and I was not required to force or stress any parts in the process of putting it back together.
Any Ideas ?
Thanx
GM

I was able to return both my hard drives to the store....no problems.
Interesting what they told you about the Scorpio. I can only tell you that I've had no problems at all since I changed.
The vibration and humming sound were very annoying....I can certainly relate to your dilemma.
Good luck!

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