IMac sound is no longer working- help?

This morning i turned on my iMac and the sound is no longer working. When i turn on the computer the start up chime in audible, but after that nothing can be heard through itunes, safari, or anything. When i hit the volume keys on my keyboard it shows that the volume is maxed and underneathe there is a circle with a cross through it. I first tried to resolve the problem by going into system preferernces and disconnecting my keyboard from bluetooth and then reconnecting. That didnt work, so i then put my computer to sleep, then restarted it, then shut it down. Still nothing has changed. I followed this up by resetting the SMC and PRAM, but that also has done nothing. Im not entirely sure what to do! If someone could help me out thatd be great. I feel like there should be a simple solution to this problem, but im just missing it!

Reset the SMC and PRAM each at least 2-3 times. I don't know where you got instructions for these resets so please navigate to Intel iMac SMC and PRAM resets for correct instructions just in case.

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JonHob wrote:
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I used a UVC-compliant USB Logitech camera (the
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[SOLVED] USB Sound card no longer working

I have used a Focusrite Scarlett 2i2, a USB audio interface, as my default sound card for the last two months or so. Its output comprises two RCA jacks. I have a cable that is two RCA male leads on one end and an 1/8" on the other. I use this cable all over the house, so I unplug it often. The USB device remains connected. Last night, while plugging the cable back into the device, I jostled the USB and the device lost power momentarily. Since then, ALSA has not been able to "see" the device. The device is, and always has been, plugged into a D-Link USB hub, which goes into the computer.
I did pacman -Syu and rebooted to no avail.
uname -r
3.15.1-1-ARCH
lsusb | grep -i focusrite
Bus 001 Device 005: ID 1235:8006 Focusrite-Novation Focusrite Scarlett 2i2
modinfo snd_usb_audio
http://pastebin.com/CEMr6Gif
cat /etc/modprobe.d/alsa-base.conf
#options snd slots=snd_usb_audio,snd_hda_intel
options snd_hda_intel index=-2
options snd_usb_audio index=0
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cat /proc/asound/modules
0 snd_hda_intel
1 snd_hda_intel
lspci -nn | grep -i audio
00:14.2 Audio device [0403]: Advanced Micro Devices, Inc. [AMD/ATI] SBx00 Azalia (Intel HDA) [1002:4383]
01:05.1 Audio device [0403]: Advanced Micro Devices, Inc. [AMD/ATI] RS880 HDMI Audio [Radeon HD 4200 Series] [1002:970f]
aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: HDMI [HDA ATI HDMI], device 3: HDMI 0 [HDMI 0]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: SB [HDA ATI SB], device 0: ALC889A Analog [ALC889A Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: SB [HDA ATI SB], device 1: ALC889A Digital [ALC889A Digital]
Subdevices: 1/1
Subdevice #0: subdevice #0
lsmod | grep '^snd'
snd_hda_codec_realtek 48535 1
snd_hda_codec_generic 50352 1 snd_hda_codec_realtek
snd_hda_codec_hdmi 36976 1
snd_hda_intel 18830 0
snd_hda_controller 19667 1 snd_hda_intel
snd_hda_codec 91154 5 snd_hda_codec_realtek,snd_hda_codec_hdmi,snd_hda_codec_generic,snd_hda_intel,snd_hda_controller
snd_hwdep 5162 1 snd_hda_codec
snd_pcm 68932 4 snd_hda_codec_hdmi,snd_hda_codec,snd_hda_intel,snd_hda_controller
snd_timer 15678 1 snd_pcm
snd 46421 8 snd_hda_codec_realtek,snd_hwdep,snd_timer,snd_hda_codec_hdmi,snd_pcm,snd_hda_codec_generic,snd_hda_codec,snd_hda_intel
ls -l /dev/snd
total 0
drwxr-xr-x 2 root root 80 Jun 26 10:13 by-path
crw-rw----+ 1 root audio 116, 2 Jun 26 10:13 controlC0
crw-rw----+ 1 root audio 116, 5 Jun 26 10:13 controlC1
crw-rw----+ 1 root audio 116, 4 Jun 26 10:13 hwC0D0
crw-rw----+ 1 root audio 116, 11 Jun 26 10:13 hwC1D0
crw-rw----+ 1 root audio 116, 3 Jun 26 10:13 pcmC0D3p
crw-rw----+ 1 root audio 116, 7 Jun 26 10:13 pcmC1D0c
crw-rw----+ 1 root audio 116, 6 Jun 26 10:13 pcmC1D0p
crw-rw----+ 1 root audio 116, 9 Jun 26 10:13 pcmC1D1c
crw-rw----+ 1 root audio 116, 8 Jun 26 10:13 pcmC1D1p
crw-rw----+ 1 root audio 116, 10 Jun 26 10:13 pcmC1D2c
crw-rw----+ 1 root audio 116, 1 Jun 26 10:13 seq
crw-rw----+ 1 root audio 116, 33 Jun 26 10:13 timer
All this information was collected while the device has been connected to the computer. Any help is greatly appreciated. Thanks!
Last edited by gluelogic (2014-07-01 21:36:19)

emeres wrote:You only ruled out hardware failure on the device side.
This is painfully true. This morning, I realized I didn't even check the D-Link. The LEDs on the interface were lit up from the USB connection, but the AC adapter was faulty. I replaced that, restored my original configuration by removing the # from the first line of my alsa-base.conf, and now everything is working again. The D-Link was simply unable to provide the device with enough power to operate.

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IMac sound is no longer working- help?

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