Mac Mini - Firewire Issue?

Dear All,
I have a 'late 2009' Mac Mini (2.53 GHz, 4GB RAM) and I think I may have an issue with the Firewire from the computer.
I have an iSight web cam plugged in to the Mac Mini's Firewire socket via a simple 400 to 800 adapter. Everything works as it should, but I've noticed that the iSight is receiving power all the time, whether the Mac Mini is on or off. Is this normal behaviour?
Can anyone confirm whether or not this model of Mac Mini is supposed to output power to Firewire devices all the time, whether on or off?
I want to know whether this is a feature or a fault before I report the issue to Apple. Also, will any harm come to my iSight by being powered up all the time?
It may be unrelated, but I've noticed that I get fan noise from the Mini all the time now. When the computer was new, it was silent under normal use. Could this indicate a more general problem with my mini?
Thanks for your help in anticipation.
Best Wishes,
Richard

Richard Mccarthy wrote:
Dear All,
Again, thanks for much for your replies; it is really appreciated.
You're welcome, Richard, and thanks for the feedback!
Thanks also for confirming that there's nothing wrong with my Mac - I was beginning to get worried!
If you ever have serious electrical concerns, I strongly recommend that you unplug your Mac until you can have it examined by an Apple Authorized Service Provider.
I'll give the vacuuming along the bottom of the computer a go; is there any risk from static or harming the Mac min that I should be aware of?...
There are instructions for how to clean each Mac in the users guide manual that came with every Mac I have ever owned. Check yours to be sure you are within the mini's instructions. If you still have problems or concerns about cleaning your mini, ask your AASP.
I have never owned a mini, but I regularly clean and vacuum my Macs. Here are my guidelines:
 • keep the covers are properly in place,
 • keep the Mac connected to a properly grounded electric outlet,
 • do not insert the vacuum nozzle or dust brush into the Mac's vents or other openings.
These rules have kept my desktop Macs safe and working.
DaddyPaycheck has offered mini-specific suggestions.
If fan noise bothers you, also check placement: http://support.apple.com/kb/TA22804
Message was edited by: EZ Jim
Mac Pro Quad Core (Early 2009) 2.93Ghz Mac OS X (10.6.4); MacBook Pro (13 inch, Mid 2009) 2.26GHz (10.6.4)
LED Cinema Display; G4 PowerBook 1.67GHz (10.4.11); iBookSE 366MHz (10.3.9); External iSight; iPod touch 4.1

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