Sharp audible click when powering on/off

Running 10.4.7 on an Intel iMac and just starting getting a sharp clicking sound (single sound) when either turning the computer on or off. No behavior changes in terms of speed, display or stability, but I'd like to find out if other machines are doing this.

Is this click coming from your speakers, whether the built-ins or attached? I ask because most of us seem to get a click or pop when the Mac wakes from sleep, etc. Isn't all that loud on my system and doesn't bother me, but some folks really dislike it and have mentioned it (read moaned & complained) extensively in the past. Seems like maybe the sound chip or something 1st powering up.

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Audible click when playing sounds

For a few months now, I've had an FiiO Olympus E-10 USB headphone amp. The reason for getting it was convenience; it allows me to just unplug the Thunderbolt cable from my MacBook Air and leave my headphones hooked up to the Thunderbolt Display through the E-10. The audio quality is actually quite good, but for some reason I get an audible click every time audio stops.
When a system sound has finished playing, there is a click
When I pause a YouTube video or when it ends, there is a click
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Additional data points :
When I have the headphones connected to my audio jack on the MBA, the click does not happen.
When I have another pair of headphones connected to the E-10, the click also happens.
No specific drivers were installed to support the device. None are available on the manufacturers site either.
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Any thoughts on how to resolve it without buying a new device?

Is this click coming from your speakers, whether the built-ins or attached? I ask because most of us seem to get a click or pop when the Mac wakes from sleep, etc. Isn't all that loud on my system and doesn't bother me, but some folks really dislike it and have mentioned it (read moaned & complained) extensively in the past. Seems like maybe the sound chip or something 1st powering up.

Does iphone lose battery when powered/turned off??

So my lock button at the top of the iphone 4 doesn't work and i used the assistive touch button to lock screen when needed. The reason i didn't go to apple store is that i have past my warranty and didn't buy apple care.
Anyway, the other day, the iphone shut down unexpectedly at around 40%.
Now, normally, if it shuts down, it'll only be because of the battery being lower than 4%, and so all i had to do was to it in to power adaptor.
BUT, because i know that the percentage left is closer to 40%, then i was wondering whether the iphone would lose battery. Because if that happens, i can just wait for a couple of hours before plugging it in....

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http://i1224.photobucket.com/albums/ee374/Diavonex/ac7f6dc314aca5d618ac2f55616be 20e_zpsa92a3ebd.jpg

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Message was edited by: MikeMacBP2011

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[http://kb.mozillazine.org/Problematic_extensions Problematic Extensions]
[https://support.mozilla.com/en-US/kb/Troubleshooting%20extensions%20and%20themes Troubleshooting Extensions and Themes]
[http://support.mozilla.com/en-US/kb/Uninstalling+add-ons Uninstalling Add-ons]
[http://kb.mozillazine.org/Uninstalling_toolbars Uninstalling Toolbars]
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Hi AlmightySi
Welcome to Apple Discussions
A Self-powered USB Hub or Computer Sleep, an iMac can sleep 24-7 for weeks without a problem.
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TCampbell wrote:
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http://support.apple.com/kb/ht1379
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http://support.apple.com/kb/HT3964
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This really sounds like shoddy drivers combined with an IRQ conflict.
I suggest you post your IRQ's from System Info, for example:
IRQ 0   System timer   OK
IRQ 1   Standard 101/102-Key or Microsoft Natural PS/2 Keyboard   OK
IRQ 4   Communications Port (COM1)   OK
IRQ 5   WinFast TV2000 XP WDM Audio Capture   OK
IRQ 6   Standard floppy disk controller   OK
IRQ 8   System CMOS/real time clock   OK
IRQ 9   Microsoft ACPI-Compliant System   OK
IRQ 11   NVIDIA nForce PCI System Management   OK
IRQ 12   Logitech-compatible Mouse PS/2   OK
IRQ 13   Numeric data processor   OK
IRQ 14   Primary IDE Channel   OK
IRQ 15   Secondary IDE Channel   OK
IRQ 16   RADEON X800 XT Platinum Edition   OK
IRQ 17   WinFast TV2000 XP WDM Video Capture   OK
IRQ 18   Creative SB Live! series   OK
IRQ 20   NVIDIA Network Bus Enumerator   OK
IRQ 21   Standard OpenHCD USB Host Controller   OK
IRQ 22   Standard OpenHCD USB Host Controller   OK
IRQ 23   Standard Enhanced PCI to USB Host Controller   OK
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Take all the Driver CD's and make pretty Christmas tree ornaments out of them
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Sharp audible click when powering on/off

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