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Posted 28 May 2013 - 02:46 PM
Posted 28 May 2013 - 06:27 PM
This sounds like a low frequency harmonic is feeding through into your audio section, the original frequency is probably connected with data supply in and out of your hard drives. Your audio section should include filtering to keep these harmonics off the 'Audio out' so as not to interfere with your listening pleasure. A computer is a mass of different frequencies - everything from mains hum up to the CPU clock - this suggests that something has gone wrong with one of the filtering sections.
As this is probably non-repairable, unless you feel qualified to start trying to replace surface mounted components, then the only way to test is replacement. If you are using the on-board audio system, you could try to borrow a separate plug-in audio card to see if that stops the problem. If you are using a separate audio card, then try unplugging it and using the on-board sound system to see if that stops the noise. A consolation, if you decide a separate sound card is the way forward, is that they are not very expensive. My local computer store lists six models, with the most expensive being £UK 27.
If you are already using a sound card, one quick thing you could try first unplugging and re-seating it, and doing the same for its power connector.
Posted 30 May 2013 - 11:31 AM
Thank you for those ideas - I think I will give a separate audio card a try.
Today I noticed something that may in fact be related. If you stand a bit away from the display, you can just barely make out some very subtle horizontal bars which seem to sporadically float from bottom to top. These look a lot like what I used to call "hum bars", but again they are very subtle. I don't know what the vertical refresh rate of a typical LCD monitor is but I wonder if this is related...
Posted 30 May 2013 - 04:52 PM
Edited by MrBruce1959, 30 May 2013 - 05:00 PM.
Posted 07 June 2013 - 10:22 AM
Please keep us posted as to whether you find and eliminate the cause of this annoyance.
Posted 26 September 2016 - 11:33 AM
Whoa. I missed that last post...sorry for this very, very late status.
Actually I have not remedied this issue - I have several PC's wired through a KVM box, and since none of the others exhibit the noise, I simply use one of the those for audio.
Someday, when I have some free time (yeah, right) I will really troubleshoot this.
My thanks to everyone who took the time to reply to this thread.
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