September 2011 MacBookAir4,2 1.7 GHz White noise even when sound turned off
Since new this MacAir has had a white noise like a tv not tuned in even when sound is off. Gets worse as it gets warmer. Seems to be getting worse then ever.(summer). Usually connected to a Thunderbolt Display and makes noise only when display is attached. Disconnect the display and the noise goes quite after a few minutes till display is again attached.
Mountain Lion OS X 10.8.2 (12C60)
I think it is the Cooling Fans making the noise and the Thunderbolt connector gets hot after a few minutes.
Rom Ver MBA41.0077.B0F
Regards
Barry
Hello and Welcome to Apple Discussions.
Try checking the hard disk for errors just in case.
Open Disk Utility, in the Utilities folder in the Applications folder.
Insert your Mac OS X Install disc in your computer’s optical drive or an optical drive connected to your computer, and then restart your computer. When you hear the startup tone, hold down the C key until you see the progress indicator, which looks like a spinning gear.
Follow the onscreen instructions until the menu bar appears with the Utilities menu in it, choose Utilities > Disk Utility, click First Aid, and then click Verify. Of Disk Utility reports errors, click Repair. When it's finished, from the Menu Bar, select Utilities/Startup Disk. In the Startup Disk window select MacintoshHD 10.x.x and click Restart.
Also, while you have Disk Utility open, Repair Disk Permissions, reboot and see if the sound anomaly still exists.
Carolyn
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