WIFI connection issue: After upgrading to Yosemite, I lose my connect in SOAS, university of London. Overtime, it rejects me as Authentication fails in this network. Even the school technicianer cannot fix. I wonder how to downgrade or any solution?

After upgrading to Yosemite, I lose my connect in SOAS, university of London. Overtime, it rejects me as Authentication fails in this network. Even the school technicianer cannot fix. I wonder how to downgrade or any solution? I never encounter this issue with Mavericks or the one before.

I also have the internet diagnostic report, but it is nonsense to me to read it.

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http://support.apple.com/kb/PH18599?viewlocale=en_US
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After upgrading to Yosemite my wifi is not working on my 2011 MacBook Pro. What happened Apple? Wifi was fine on Mavericks.Yosemite was free. I guess you get what you pay for.

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Start up in Safe Mode.
http://support.apple.com/kb/PH14204?viewlocale=en_US
Any Bluetooth mouse with failing batteries nearby?

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Thanks for the question. After reviewing your post, it sounds like you are having trouble hearing sound from the iMac speakers. I would recommend that you read this article, it may be able to help you resolve or isolate the issue.
Troubleshooting issues with no audio from built-in speakers on Macs
Thanks for using Apple Support Communities.
Have a nice day,
Mario

WIFI connection issue: After upgrading to Yosemite, I lose my connect in SOAS, university of London. Overtime, it rejects me as Authentication fails in this network. Even the school technicianer cannot fix. I wonder how to downgrade or any solution?

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