Speakers suddenly mute and the Mac says no sound device installed

¿Can anybody give me a clue why my iMac doesn't sound anymore? It seems not to detect the speakers. It all begun while using Garageband.

> I only get the very beginning start up sound
Reset Parameter RAM - hold down apple/option/p/r at start and wait for three chimes before releasing.

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Hi, I am prompted to download the latest Tunes software (10.7) but after starting the process is stopped and the massage says "Errors occured while installing, if the problem persists choose Tools download only) This process also stops part way through

Hi, I am prompted to download the latest I Tunes software (10.7) (I have done this sucessfully for other versions many times before)
The process starts but stops quite quickly.A message pops up "Errors have occured while installing updates, if the problem persists choose Tools>Download Only and install manually" When I try this it still fails but another message pops up "Invalid signature, the download has been removed"
Not very sharp on computers so any help would be appreciated.
Regards

Try updating your iTunes using an iTunesSetup.exe (or iTunes64Setup.exe) installer file downloaded from the Apple website:
http://www.apple.com/itunes/download/

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My compaq presario v5000 has no sound and no amount of drivers or fixes 've found here work. Is there a scan you can do to see if my sound card is buggered?

Did you follow through both documents from start to finish? If you have and it does not resolve the issue, you can consider a factory restore. If that fails you may have hardware failure.
TwoPointOh
I work on behalf of HP
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos, Thumbs Up" on the bottom to say “Thanks” for helping!

I have Itunes10.6 on my macbook but just got a new iphone and it says i need to upgrade my mac but the mac says it has the latest version??? Should I download the newer version?

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http://store.apple.com/us/product/MC573Z/A/mac-os-x-106-snow-leopard
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I have Mac mini and I'm trying to listen to music through YouTube it works. But my problem is that instead of the music playing through the tv speakers it plays through the Mac box. ):

I have Mac mini and I'm trying to listen to music through YouTube it works. But my problem is that instead of the music playing through the tv speakers it plays through the Mac box. ):

Are you using HDMI or an Apple Airplay Module to go to the TV Speakers?
If you are using an HDMI it's straight through output. The internal speakers are disabled.
If you are using an Airplay Module:
- Go on iTunes
- Locate the Airplay icon that has a TV with an up arrow icon much like your iPhone has for Bluetooth
- Click on that and Airplay to ModuleName

I have a family video DVD that was originally on tape, but is now on disc. I want to import it onto my MacBook to edit and store. However the files are IFO, BUP and VOB and the Mac is saying 'unable to import' as it doesn't recognise the file. Help !!

I have a family video DVD that was originally on tape, but is now on disc. I want to import it onto my MacBook to edit and store. However the files are IFO, BUP and VOB and the Mac is saying 'unable to import' as it doesn't recognise the file. Help please !!!!!

Those are the constituent parts of a standard mpeg2 DVD. Storing them is easy: just copy the folder to your hard drive and they will play in DVD player or VLC.
But that format is not intended for editing. To do so:
You need to convert the VOB files in the TS-Folder of the DVD back to DV which iMovie is designed to handle. For that you need mpegStreamclip:
http://www.squared5.com/svideo/mpeg-streamclip-mac.html
which is free, but you must also have the Apple mpeg2 plugin :
http://store.apple.com/us/product/D2187Z/A/quicktime-mpeg-2-playback-component-f or-mac-os-x
(unless you are running Lion in which case see below))
which is a mere $20.
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http://www.dvdxdv.com/NewFolderLookSite/Products/DVDxDV.overview.htm
which costs $25.
For the benefit of others who may read this thread:
Obviously the foregoing only applies to DVDs you have made yourself, or other home-made DVDs that have been given to you. It will NOT work on copy-protected commercial DVDs, which in any case would be illegal.
And from the TOU of these forums:
Keep within the Law
No material may be submitted that is intended to promote or commit an illegal act.
Do not submit software or descriptions of processes that break or otherwise ‘work around’ digital rights management software or hardware. This includes conversations about ‘ripping’ DVDs or working around FairPlay software used on the iTunes Store.
If you are running Lion:
From the MPEG Streamclip homepage
The installer of the MPEG-2 Playback Component may refuse to install the component in Lion. Apple states the component is unnecessary in Lion onwards, however MPEG Streamclip still needs it. See this:
http://support.apple.com/kb/HT3381
To install the component in Lion, please download MPEG Streamclip 1.9.3b7 beta above; inside the disk image you will find the Utility MPEG2 Component Lion: use it to install the MPEG-2 Playback Component in Lion. The original installer's disk image (QuickTimeMPEG2.dmg) is required.
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Boot in safe mode (shift key down at startup) and check to see whether the clipboard now works. If it does, reboot as usual (not in safe mode) and try again.
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MacBook pro 13 inch,
Processor 2.7 GHz Intel Core i7
Memory 4 GB 1333 MHz DDR3
Graphics Intel HD Graphics 3000 384 MB
Software Mac OS X Lion 10.7.5 (11G63b)
91gb free space
0.68 mbps /:

I can't hear any sound from my macbook. It's not on mute and the volume is turned all the way up, I can't hear any sound from my macbook. It's not on mute and the volume is turned all the way up

I can't hear any sound from my macbook. It's not on mute and the volume is turned all the way up, I can't hear any sound from my macbook. It's not on mute and the volume is turned all the way up. Any ideas?

Go step by step and test.
1. System Preference > Sound > Output > Internal Speakers
    Highlight Internal Speakers.
    Make sure that Mute is not enabled.
2.Plug in and remove the headphone.
    If you see red light in the headphone port, plug the headphone
    in and out of the port 5 or 6 times to flip the microswitch inside.
    Sound output may be stuck in the digital mode.
3. Reset PRAM. http://support.apple.com/kb/PH4405
4. Reset SMC.     http://support.apple.com/kb/HT3964
    Choose the method for:
    "Resetting SMC on portables with a battery you should not remove on your own".
5. Applications > Utilities > Audio MIDI Setup
    Audio Devices window
    Side Bar
    Click the Built-in Output.
    Under Mute any of the boxes checked? If so, uncheck it.

Suddenly most of the applications have no sound and I can't adjust the volume, and when I try with the volume button, appear the message "sound effect" and nothing append

Suddenly most of the applications have no sound and I can't adjust the volume, and when I try with the volume button, appear the message "sound effect" and nothing append

Hello, Miryam Maria.
Thank you for visiting Apple Support Communities.
I see you are experiencing issues with sound on applications when playing video/audio content. If this is the case, the first thing I would check is if the side switch is set to silent as this can cause applications to be mute. Below I have included an article that covers adjusting the settings for the side switch. Also, make sure to close all applications in Multitasking and power cycle the device. Test the sound issue after processing these steps.
iPad: Understanding the side switch
http://support.apple.com/kb/ht4085
iOS: Force an app to close
http://support.apple.com/kb/ht5137
Cheers,
Jason H.

I want to download iBooks Author on our iMac (which has OS 10.6.8) and the download says that OS 10.7.4 or later is required. When I click to update, I'm told there are no updates available. Help?

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Welcome to the Apple Support Communities
That's because OS X Lion is a paid upgrade. The most recent OS X version is Mountain Lion, so I recommend you to upgrade to this version.
First, make sure that your Mac is supported > http://www.apple.com/osx/specs If your Mac is supported, open App Store and purchase Mountain Lion. While Mountain Lion is downloading, you can make a backup of your files, so you won't lose them if the upgrade fails.
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Speakers suddenly mute and the Mac says no sound device installed

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