Help! Can't stop AHT on my MacBook Pro!

The fan on my MacBook Pro (2012 model) has been coming on a lot over the years but it seems to be getting worse, usually when watching videos but sometimes even just web surfing.
I was going to bring it in to the genius bar, but there was a recommendation that I run AHT on it first, so I did. Well, I did the extended test, which said it would take an hour. The fans immediately started going at a very high speed, so I decided to stop it, but when I hit the "Stop Testing" button, nothing happened. I hit Command . a couple of times for good measure, but nothing.
How do I stop this thing? If I press and hold the Start button, will my system get hosed?
HELP!
Thanks,
Karin

This is the risk that you run per Apple by holding the Power button to turn off your MBP:
Try a SMC reset:
http://support.apple.com/en-us/HT201295
That may stop the fan from spinning too fast.
Ciao.

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Help! Can't stop AHT on my MacBook Pro!

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