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All replies
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Helpful answers
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Jun 15, 2015 8:53 AM in response to Chas Williamsby Chas Williams,As an update, I just repaired permissions and restarted. White noise all during restart.
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by rkaufmann87,Jun 15, 2015 8:56 AM in response to Chas Williams
rkaufmann87
Jun 15, 2015 8:56 AM
in response to Chas Williams
Level 9 (58,929 points)
Photos for MacRepairing permissions is a total waste of time. However one thought is to go to Adobe's website and ensure the version of Flash you have is up-to-date. Many Youtube videos rely on Flash.
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Jun 15, 2015 11:37 AM in response to Chas Williamsby Old Toad,Boot into Safe Mode, Mac OS X: Starting up in Safe Mode, and see if the noise continues. Does it?
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Jun 15, 2015 1:24 PM in response to Old Toadby Chas Williams,White noise continued all during boot in safe mode and restart.
I shut down and unplugged for several minutes, but noise was still there during start up.
Thanks for the suggestion though; made sense to try.
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Jun 15, 2015 1:39 PM in response to Chas Williamsby Mike Sombrio,Does it sound like it could be a fan noise? You might try resetting the SMC Resetting the System Management Controller (SMC) on your Mac - Apple Support
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Jun 15, 2015 2:35 PM in response to Mike Sombrioby Chas Williams,Thanks for the reply.
It's definitely not fan noise; white noise generated by something.
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by rkaufmann87,Jun 15, 2015 2:41 PM in response to Chas Williams
rkaufmann87
Jun 15, 2015 2:41 PM
in response to Chas Williams
Level 9 (58,929 points)
Photos for MacChas,
When you hear it, open Activity Monitor (Applications - Utilities - Activity Monitor) and see what apps are running. Methodically go through them and quit apps and then listen, if it is app related that way you can narrow it down to a specific app.
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Jun 15, 2015 3:59 PM in response to rkaufmann87by Chas Williams,I'm not familiar with the Activity monitor, but it seemed that all apps were off.
Noise is still constant.
Thanks
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Jun 15, 2015 4:01 PM in response to Chas Williamsby Chas Williams,I did open AM and check for apps running.
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by rkaufmann87,Jun 15, 2015 4:01 PM in response to Chas Williams
rkaufmann87
Jun 15, 2015 4:01 PM
in response to Chas Williams
Level 9 (58,929 points)
Photos for MacChas Williams wrote:
it seemed that all apps were off.
That is impossible! Please carefully read Apple's Use Activity Monitor on your Mac - Apple Support
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Jun 15, 2015 4:55 PM in response to Chas Williamsby den.thed,A few times in the distant past, I have heard where the optic sensors on some Mice caused audio white noise. I'm not sure if the problem(s) were caused by USB or a wireless mouse, but I'm guessing that it could be either one depending on your audio setup and/or how you are recording.
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Jul 12, 2015 1:38 PM in response to rkaufmann87by Chas Williams,Hello rkaufman87, are there any apps that will hurt anything if I turn them off? There are a lot of them that I have no clue what they do?
Thanks for the help,
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Jul 12, 2015 1:40 PM in response to Chas Williamsby Chas Williams,Hello, I appreciate the help so far. I've dug a little deeper...
It is a constant high speed fan noise; sounds like white noise.
Resetting the SMC and pram ddn't work. I took the machine to the Genius bar, but the fans then would not go into high speed; All behaved perfectly.
They ran a bunch of diagnostic tests. All elements showed as fine.
I got the iMac home and it worked well for a while, then the fans went to high again. Resetting SMC, again has no effect.
Thinking it may be a hardware problem with the fans?
Thanks
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Jul 12, 2015 2:27 PM in response to Chas Williamsby Mike Sombrio,Fan noise huh? Whoda thunk it?
You might try running Apple Diagnostics to see if it reports an error. OS X Yosemite: Use Apple Diagnostics or Apple Hardware Test
Regarding Activity Monitor apps that are listed as being used by you can be turned off, if they're being used by the system you probably shouldn't mess with them. Does the fan noise exist if you're booted in Safe mode? Try safe mode if your Mac doesn't finish starting up - Apple Support