Popping Sound

It sounds like maybe you haven't run the installer yet? Open Applications and look for a the El Capitan Installer app.

Try this. Close Mail if it's open. Open open up system preferences and go into Internet accounts. Uncheck mail for each account you have in there. Go back in and remove all of the Envelope Index files. You should now be able to open Mail with no accounts in there. Now just go into accounts and enable Mail in each of your internet accounts and they should pop right back up. They will have to redownload the messages, but you should have all of your stuff in there.

Using BETA version 10.11 Beta (15A215h). I have lost the capability to conduct audio and video chats. The previous audio/video chat icon (option) in Messages preference menu is missing. When I identify an available buddy from my buddies list, the only option I have is a text message, audio and or video (or screen sharing) is no longer an option. I can not find the details option as previousely mentioned. Any suggestions would be appreciated. Thank You.

>set to the location in Portugal PTDid you mean 'region' (for currency/date formats, etc.)...?If testing the language returns PT, then that is the language set on the device...sounds like you didn't really set the device to EN? Did you delete old versions being tested, option-clean the build and then test to a device configured for language EN?

This sounds like the kind of issue that you should file a radar issue over.

I waited and it eventually came back with the time and counted down from 10 minutes. When it looked like the install had hung I pressed a bunch of keys on the keyboard and heard the error tone (like keystroke was not accepted sound). My external hard drive that I use for time machine had its r/w indicator light blinking as well. This led me to believe that the install was actually not hung. A little while later my second monitor woke up and the time on the progress bar showed up again with 10 minutes left and the text 'competing installation.' 10 minutes later I was prompted with the login screen and was able to log in (took a while for the first login to complete as well). When I found this thread I was going to force restart but I'm glad I didn't. Whole update to public beta lasted almost exactly two (2) hours from when I kicked it off. Be patient my friends...

Sounds like you have tried almost everything worth trying. It would be interesting to know if resetting all settings does the trick.

I was thinking that, the same cables work on my ipad but not the iphone...Hmmm but funny I did hear the (pong, or boom sound/ connecting sound) when i tried taking it out and putting it back in a few times and then it stopped again... Just thinking something is shutting it down temporarily

Oh nuts. I was afraid of that. Sounds like I have to reinstall b1-b3 etc. blah.

Same here, airplay device not visible into sound preferences as output device.

The problem is probably caused by one of the coreservices that only come into play for a full user account is crashing due to some configuration or 3rd party app on your older version of OS X that the beta failed to deal with properly when it installed itself over the old system.Reinstalling El Capitan over itself probably won't help your issue, but you can try: the installer is probably still in your Applications folder and you can try running it again from Safe Mode.First though, you need to boot into Safe Mode and copy your photos to another drive or upload them to iCloud or other cloud based storage.If reinstalling doesn't help, you'll need to erase your disk and install a stable OS X by following the following instructions:Before you begin, you need to be connected to the Internet.Choose Apple menu > Restart, and then hold down the Command (⌘) and R keys while the computer restarts.Select “Disk Utility,” and then click Continue.Select your startup disk from the list on the left, and then click the Era

Unless you have access to another Mac or a working OS X on the Mac you're talking about, you can't reinstall El Capitan over itself.As per KMT's answer, if you can boot into Recovery Mode and you have a Time Machine backup then your best option may be to restore to that.Otherwise, if you just want to wipe your Mac and start again then this support page that the Public Beta site references for those who want to revert back from the Public Beta to a stable release version provides the following solution:You can use Disk Utility to erase the disk before reinstalling. If you’re installing on a notebook computer, make sure your power adapter is connected and plugged in. Use these steps if you need to erase a disk before installing OS X:Before you begin, you need to be connected to the Internet.Choose Apple menu > Restart, and then hold down the Command (⌘) and R keys while the computer restarts.Select “Disk Utility,” and then click Continue.Select your startup disk from the list on the left, and then click the