Yes, it could be. May I assume the "another" HDD have the same problem?
Note that there may not be a problem at all .. that a HDD doesn't work at a
constant rate - it will spin up and down and make different noises depending
on the demand made on it. Furthermore, your computer may put it to sleep
after so many minutes of user inactivity in order to reduce power
consumption.
Now please post in plain text next time, eh?

)
Saucy
"DarkNight" <n/a> wrote in message
news:...
> Hi there!
> My computer`s hard drive spins irregular....
> It is brand new, and I tried another hard drive as well.
> My computer chassis is also brand new, so it is suppose to be stable.
>
> Can this be of a faulty PSU?