Strange knocking sound in OS X

Hi,
I'm just wondering if this is normal, haven't found any info on Google. My iMac is making a strange knocking sound, but it's coming from within the OS as I can turn the volume up and down on the noise. Just started today and a simple reboot didn't resolve, neither did updating. I had plugged in an external harddrive but I ejected and unplugged it, as well as ejected and unplugged my kindle and ipod.
Anyway. Never heard the sound before, didn't hear any similar sounds under the 'sounds' in system prefs that were familiar. It's a bit like a knocking sound, or maybe a raindrop if you want to get specific
Anyway any help is appreciated.......

~Bee's response is right on the dot. Like the free "Brady Bunch" font, which causes the same problem, "Alien (Alien League)" has an incorrect internal font name in the same place. The internal names are as follows:
PS Font Name: Alien League
Full Name: Arial
Menu Name: Alien League
FOND Name: Alien League
Can you guess which one is causing the font conflict? Google uses Arial pretty heavily, which is why you're seeing Alien League replacing it in your browser.

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Strange Knocking

please someone help!
Computer virgin needs help with this strange knocking that has infested my computer and is slowly driving me crazy.
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Hi,
Is that a mechanical sound or does it come from the notebook's audio system?
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Try resetting your SMC and PRAM.
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Send Apple feedback. They won't answer, but at least will know there is a problem. If enough people send feedback, it may get the problem solved sooner.
Feedback
Or you can use your Apple ID to register with this site and go the Apple BugReporter. Supposedly you will get an answer if you submit feedback.
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Hello
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Strange knocking sound in OS X

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