How to Keep a Noisy LinkSys Gigabit Switch Quiet?

I need to find a way to keep a LinkSys Gigabit switch (EG008W) quiet.
From day one, it makes a relatively loud noise when I power it up; I
can hear the noise even I have closed the door of the equipment closet.
This sounds like noise from a noisy fan. If this is the case, I may be
able to replace the noisy fan with a quiet one. The problem is that I
don't see how it can have a fan inside its low-profile chasis.

No, I cannot get a refund because I left it in the box over 15 days
before I powered it up for the first time, and I bought it from CompUSA
who has that short refund period.

I have already sent it back twice and get two different replacement
units (of the same model). And all three of them are noisy in exactly
the same way. Seem like this is by design, and is not a random
manufacturing defect. I cannot afford to send it back because the
shipping cost is becoming more expensive than the switch itself.

My questions a
- Where is the noise coming from?
- How can I keep the noise down?
- How can I open it and look inside without
breaking it apart? The case is really hard
to open, and there is no screw.
- Does anyone try this before?

Thanks.

Jay Chan