T520 - high pitched sound from speakers

Hello,
As of today, something strange has been happening.
My T520 automatically plays back my voice and I can hear high pitched static and my voice echo in the background as well as my typing. I thought shutting down my computer and rebooting would do the trick but it doesnt: as soon as I get to the windows 7 welcome screen where it's loading, the play back happens.
I didn't set this setting and I've never heard of this before.
Any help is appreciated.

Robert Riedlinger wrote:
How can I get rid of this noise and still use my phantom powered mic (which sounds great otherwise)?
Something may be wrong with the mic itself, or the mixer. If you can swap out one, that could help pinpoint the culprit.
As a quick test, you could try plugging the mic into a different input in the mixer and see if that helps.
Also, to double-check, are you sure you're not getting any feedback (are your headphones leaking)?

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T520 - high pitched sound from speakers

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