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Apple Computing Products:
macOS - Desktop Hardware
Mac Pro 2012 Random “Snap” Sound
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<blockquote data-quote="Nanco" data-source="post: 1824038" data-attributes="member: 50325"><p>The sound is handled by an Apogee Ensemble interface via firewire which then sends the audio to my external speaker set up. This is the default I/O device so the internal Mac speaker is not actually used besides for the startup chime.</p><p></p><p>After isolating the Mac from the power strip yesterday, all was well until about midnight when I had two snaps within the space of about 10 minutes of each other. Nobody else was around at that time and no other electrical appliances were in use in the building to my knowledge.</p><p></p><p>Today I’ve gone one step further and basically unplugged everything apart from the essentials (mouse, keyboard, one screen) and I’m also powering the screen independently from my outboard equipment. The main outboard power cable is unplugged and the switch turned off. Within the first maybe 10 minutes of the machine being turned on, I had about two or three snaps.</p><p></p><p>I’m not completely ruling it out, but I’m not entirely convinced that the problem is anything to do with what is going on outside of the Mac at this stage. The next thing I’m probably going to do is inspect the fans including the graphics cards and maybe try disconnecting one at a time to see if that helps to locate the snapping source.</p><p></p><p>I don’t know if its at all possible to give an accurate answer, but how long should I leave the Mac turned on with one of its fans removed? Obviously temperatures will be affected, but considering the random nature of this snap, I’m not sure that I would want to have a fan removed all day waiting for the snap to occur if there is sign of it damaging the computer in any way.</p><p></p><p>On a side note, the power supply fan appears to be emitting a low whirring sound (the pitch is roughly 40hz at around 600-650 RPM). Funnily enough I don’t recall this fan being so noticeable even when idle and under no major load (I've just lived with it for a while). Could this be linked with my problem or just something entirely different? Is it worth investing in a replacement?</p><p></p><p>Thank you both for your help so far. I'm determined to get to the bottom of this.</p></blockquote><p></p>
[QUOTE="Nanco, post: 1824038, member: 50325"] The sound is handled by an Apogee Ensemble interface via firewire which then sends the audio to my external speaker set up. This is the default I/O device so the internal Mac speaker is not actually used besides for the startup chime. After isolating the Mac from the power strip yesterday, all was well until about midnight when I had two snaps within the space of about 10 minutes of each other. Nobody else was around at that time and no other electrical appliances were in use in the building to my knowledge. Today I’ve gone one step further and basically unplugged everything apart from the essentials (mouse, keyboard, one screen) and I’m also powering the screen independently from my outboard equipment. The main outboard power cable is unplugged and the switch turned off. Within the first maybe 10 minutes of the machine being turned on, I had about two or three snaps. I’m not completely ruling it out, but I’m not entirely convinced that the problem is anything to do with what is going on outside of the Mac at this stage. The next thing I’m probably going to do is inspect the fans including the graphics cards and maybe try disconnecting one at a time to see if that helps to locate the snapping source. I don’t know if its at all possible to give an accurate answer, but how long should I leave the Mac turned on with one of its fans removed? Obviously temperatures will be affected, but considering the random nature of this snap, I’m not sure that I would want to have a fan removed all day waiting for the snap to occur if there is sign of it damaging the computer in any way. On a side note, the power supply fan appears to be emitting a low whirring sound (the pitch is roughly 40hz at around 600-650 RPM). Funnily enough I don’t recall this fan being so noticeable even when idle and under no major load (I've just lived with it for a while). Could this be linked with my problem or just something entirely different? Is it worth investing in a replacement? Thank you both for your help so far. I'm determined to get to the bottom of this. [/QUOTE]
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Apple Computing Products:
macOS - Desktop Hardware
Mac Pro 2012 Random “Snap” Sound
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