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I don't know what has happened, but suddenly my laptop can't play any sound and the volume bar has gone.

It's an Acer Aspire 4937 G, running Windows Vista Home Premium.

Update:
Restarting my laptop has fixed the problem (for now).

But I would like to know what caused this to happen in the first place, so that if it happens again I can fix it.

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up vote 1 down vote accepted

It may happen that the playback device is disabled in the list of devices.

May be you had a piece of software that did that.

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i don't think any software i had did that.. anyway i was thinking may it be because my laptop had a slight hit on the door? – Pacerier May 23 '11 at 8:33
    
@Pacerier Uhm, no, I don't think that's possible. Maybe the audio driver stopped working because of some bug, who knows? – slhck May 23 '11 at 8:50
    
@slhck you mean a bug in a software i have or a windows bug? – Pacerier May 23 '11 at 13:55
    
@Pacerier Either way - if you can't reproduce it I wouldn't worry all too much about it. – slhck May 23 '11 at 13:57

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