Mini overheating

Hello,
Just trying to canvas opinion. I've discussed this with Apple Support, and have had no real help. Very unlike Apple, but I'm very disappointed.
Ever since I've had my mini (6 months or so) the fan has been running loudly and noisily almost constantly when it was on. Using it as a DVD player in my lounge was near impossible as you couldn't realistically watch the film because of the noise.
I put this down to the small size of the mini, and so having to force air through it to keep it cool.
That was until the mini wouldn't run for any longer than 10 minutes: shutting down through (suspected) overheating due to fan failure.
Then I took a look at the base of the mini, and noticed several "hot spot" scorch marks.
Not very happy with this, I contacted Apple care. They were indifferent about it, said I should take it to an authorized repairer to look at, which I did.
They said they could check it in to look at it, but that they hadn't seen the scorch marks before and so recommended that if I wasn't totally happy to go back to Apple Care.
Which I did, 1st guy very helpful, thought scorch marks were bad, put it down as a safety concern, passed me onto "senior technician" - who was indifferent again, said I should take it back to the authorized repairer to look again.
My point is that I dont think a) the fan should have been running as it was from the start, that b) there is some underlying problem c) scorch marks are worrying - what other damage is there internally.
All in all, my feeling is that the mac has been sold unfit for purpose.
But I'd like others opinions. Does your mini have burn marks on its base too? Perhaps this is a normal thing, and I shouldn't be so worried about it?
I'll take it back to the repair shop. Fed up now though, haven't been able to use the mac for about a month due to faffing around with this and not always having the opportunity to get to the repair shop!
Cheers!
Richard.

Welcome to Apple Discussions!
The first thing to say is that your experience with this system is not at all common. Most minis, both the original G4 and the present Intel models, run sufficiently quietly that to all intents and purposes in anything other than a very quiet room, they are silent. What this would clearly indicate is that yours is not a typical system, and indeed, being highly untypical, it is not hard to extrapolate the conclusion that it is faulty, regardless of the ambivalence exhibited by Apple staff with whom you have spoken.
The Apple service provider should have taken the system from you and offered to repair it rather than give you the runaround and expect that you should continue to pursue the matter on the phone. However, since they did not, I think the time has come that you should take the rights bestowed on you by the various consumer protection laws in the UK and contact the seller from whom you purchased the system and state that they are responsible for resolving the matter to your satisfaction - the seller in UK law is the party responsible for addressing the issue.
Given that other minis run quietly and do not shut down as a consequence of overheating, it is not a matter of generic design but of a defect in your system, which may be a simple one to resolve if an approved service provider opens the system up, or which may warrant a replacement system. If you gain no immediate and satisfactory traction in dealing with the seller, contact your local trading standards office and ask them to assist you. They are the people tasked with enforcing consumer rights under the Sales of Goods Act.

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Do mac minis shut when overheated?

do mac minis shut when overheated?And do they stay off untill restarted?

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Get Temperature Monitor to see if it's heat related...
http://www.macupdate.com/info.php/id/12381/temperature-monitor
iStat Menus...
http://bjango.com/mac/istatmenus/
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http://www.islayer.com/apps/istatpro/

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