Release the keys when you hear the startup sound again. Your computer will continue to boot as normal. You may notice that this boot takes a little longer than normal. Check your sound and other settings. Test to see if you can hear sound again, and if you can adjust the volume.
Your clock may have reset during this process, so you may need to change this back. Check to see if you are running the latest version.
DJ Software - VirtualDJ - Sound Set up on MAC - For headphones and speakers
OS X Mavericks El Capitan Open the Mac App Store. Mac updates are free and are available from the Mac App Store. Click the "Updates" tab. If there are any available system upgrades, they'll be listed here. Download the latest version of OS X. Download El Capitan if it is listed in the Updates section. The download will likely take a while to complete. Install the system update. Follow the prompts to install the system update. It's a pretty straightforward process, and you won't lose any of your files or settings.
Test your sound again. Once the update has finished and you're back at your desktop, test your sound again to see if it is working. Do you have parental controls enabled? If so, the sound might be disabled at night.
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If not, I'd recommend taking it into a tech-shop; they'll know more. Yes No.
Not Helpful 3 Helpful 2. What should I do if there is no sound on my Mac and a red light at the headphone jack? Put head phones in the jack, then pull them out again a day later or take the battery in then out. Not Helpful 9 Helpful 1. What can I do if my Mac is connected to something else and won't allow me to use my internal speakers? You can open up system preferences, go to Bluetooth, and hit "Disconnect. Not Helpful 0 Helpful 0. Now, the latest version is macOS Catalina. Make sure you've disabled the check box of Mute and moved the volume slider to the right.
Quit System Preferences.
Clean Headphone Jack
Make sure you disconnect any external speaker on MacBook because it is possible that the sound might be delivered to your TV when you've plugged the MacBook to the TV. And then, Sound Controller will restart automatically so as to make Mac sound work again. The operations are different depending on whether you Mac has removable battery or not. If all the solutions above can not fix your problem, you'd better contact Apple Support for help directly. Likewise, an user from Apple Support Communities is saying "When I listened to music with my headphones yesterday, the music suddenly stopped.
It looks like the music is still playing but no sound. When you meet the problem that no sound come out through headphones plugged into Mac, some measure should be put into practice. Check if there is anything blocking the headphone port: Raise the notebook and blow air into the headphone jack to clear the dust in the line-in port. If there is obstruction on the port, it will stop Mac from playing sound through headphones.
Next, select Headphones on Outpu t section. Checked it several times but I do believe nothing is burning in the socket. I tried all mentioned above. When I startup I also don't get a startup chime sound. When I check about this Mac, System overview, Audio, I see Intel High Definition Audio, when I selected that the following shows: Audiocode: 0 Can that be considered as a hardware failure since no specific audio card is shown? Android Fix Kits. A new screen or battery is one kit away.
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Hell7 Rep: 25 3. Sometimes this problem can happening without reason at all and come back Score 1. If you running Yosemite or later check if airplayXPC helper is running at activity monitor.. Tried the sudo command several times in the past and today but to no avail. Same with the AHT. No startup chime is significant I fear. The only thing coming in my mind is..