All was generally well in the sound dpt, but over the past couple of weeks I have been getting a very 'tin-like' sound from my PowerBook in general and continuous 'larsen-like' shrill feedback thhrough the speakers. Sometimes the machine is just 'on' and it will start wisthling by itself. At present it is also very hard to simply listen to a DVD as the feedback forces you to turn the volume quite low.
I tried to set up the mike level right down, but it doesn't seem to make any difference.
Any ideas? Any software resets or hardware tests?
Bop 'til you drop
MB Air 15 | i7 | 8 Gigs of shiny DDR RAM | 512 blistering SSD
iMac 27 i5 16Gig 1TB
Time Capsule 1TB
iPhone 5: "It's fast..." & Sony noise cancelling headphones
Canon 7D proper camera with nice L glass and Lightroom 4