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iMac makes a hissing sound every so often?

A

aiqw9182

macrumors 65816
Original poster
Apr 22, 2010
1,089
0
I've noticed that my iMac occasionally makes this rather odd hissing sound occasionally. It usually happens when I stop playing a song(or any audio for that matter) and in order to make it stop I have to either raise, lower or mute the volume. The sound reminds me of something you'd hear during a hearing test only higher pitched and not as loud. It's an early 2009 24" iMac for what it's worth, anyone else experienced this issue before?
 
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