Having to keep resetting NVRAM to regain sound

Hello
My macbook air 1.6 "1304" model recently started loosing sound.
This problem appears to be quite common, as described in other discussions, no audio devices are present in the audio preference window and the volume controls are greyed out etc.
Resetting the NVRAM fixes the problem. However the machine continually loses sound, sometimes after a day sometimes after waking from sleep.
Although the audio cable and/or logic board are often considered the culprit could there be a software issue that might be causing this repeating problem.
Brgds
Steven

grumpygranni wrote:
Hi Andy the message is the standard one that says the password and username do not match.
To be honest, I've personally not seen that. Frankly it can't be a common occurance or more of a fault else others would have reported a similar problem.
Is it possible that you are typing too quickly into the boxes, and the username/passwords aren't being fully entered ? Your username will view visible of course, but perhaps be slightly more careful entering the password. Sorry if that sounds terribly patronising, it's not meant to be.
I've seen a few strange things when entering userID/password for webmail, in that I can type too quickly before the web page has had time to fully display - and the start of password has ended up at the start of the usename! (due to the page being fully displayed and the entry being reset to the userID field - despite me having already entered my ID).
So it could be that the webpage hasn't fully loaded before you've started typing.
http://www.andyweb.co.uk/shortcuts
http://www.andyweb.co.uk/pictures

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Having to keep resetting NVRAM to regain sound

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