No sound

[abitha]

So i leant my folder against my keyboard which pressed some keys. This caused a blue volume sign to appear on my screen. When I took my folder off, all sound was muted and has been ever since. I know it's not the mute key with the little speaker sign with the cross through it, but I don't know if there if any other keys which can mute the sound.
Also when I click on the volume sign at the bottom of my screen it says the sound works, but no sound comes out! I've got a computer (not laptop) so I know some shortcut keys for sound are different for computer / laptop
Someone please help!
A 

[truenorth]

As you correctly note the  issue's resolution can vary from computer to computer (and you don't tell us what you have). So here is a link to a general p[process for restoring computer sound. Hope it helps.
http://www.ehow.com/video_4950886_reset-audio-computer.html
truenorth

[abitha]

Thanks, I think my computer is a Windows Xp. I had a look at the website but nothing seemed to work, are there any other possible answers?
A 

[truenorth]

Did you actually DO any of the items that were described?truenorth

[abitha]

Yes I checked the speakers on the control pannel and it says that it's working but when I tested it, there is still no sound
A 

[truenorth]

When you followed the instructions in the video to determine what volume level was set in the "playback" mode what level did you set that to?truenorth

[abitha]

100 on both the speakers and the SPDIF, although the speakers have a green tick while the SPDIF hasn't got one but still says it is working, would that effect anything?
A