No Sound on Satellite C650

Hi
I've scouted around several forums but haven't been able to find anything to fix this problem yet.
Earlier today the sound stopped working from my laptop's headphone jack and on-board speakers. I generally use external speakers when listening to music or watching TV and if I connect the external speakers to the headphone jack no sound comes through, but if I connect them via a USB connection the sound works fine. I've tried the sound in several programmes (iTunes, Windows Media Player, VLC Media Player) and there's no sound in any of them.
Here's what I've tried so far:
1) Updating sound drivers using the latest packs from the Toshiba web site
2) Disabling and re-enabling my sound device
3) Testing and disabling the speakers from Control Panel (tests report everything working fine)
4) Using Troubleshoot on Audio Playback from Control Panel (no problems detected)
5) Muting and un-muting the system using Fn Esc
6) Checking Volume Control to ensure nothing is muted,
The device in question is a Conexant CX20671 SmartAudio HD with driver version 4.119.0.61.
I was listening to some music reasonably loud before I had this problem but I wouldn't say louder than I have on occasion in the past and the volume levels on my actual laptop weren't anything out of the ordinary, I just had it turned up louder on the external speakers.
Any help greatly appreciated.

Thanks for your suggestions, guys. I actually got home from work today and turned my laptop on and it all worked again without me doing anything. It's odd because I tried a restart (obviously) last night with no effect. The only thing I can think is that it was overheating as it had been on for quite a while before I turned it off last night!

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    [PC Information]
    Model Name                    Satellite C650
    Part Number                   PSC08C-01T019
    OS Version                    Microsoft Windows 7 Home Premium    6.1.7600
    BIOS Version                  1.40
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    Network                       Atheros AR8152 PCI-E Fast Ethernet Controller (NDIS 6.20)   version=1.0.0.27   MAC Address=00:26:6C:61:00:75
                                  Atheros AR9285 Wireless Network Adapter   version=8.0.0.258   MAC Address=00:26:B6:E3:75:5C
                                  HUAWEI Mobile Connect - 3G Network Card   version=6,0,1,268   MAC Address=00:1E:10:1F:E5:E1
    Modem                         HUAWEI Mobile Connect - 3G Modem   version=2.0.6.702
    Internet Explorer             8.0.7600.16385
    IDE Device                    TOSHIBA MK3265GSX
                                  TSSTcorp CDDVDW TS-L633C   FW version=TF20

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    hi i just like to say i had a similar fault though i would be surprised if it causing yours,but you never know,my fault was my laptop lid, [9 months old] it contains the mic ,and when the lid was in a certain angle crackles could be heard worse when i had my external sound card in, it was a faulty membrane [ lid to body] easily missed by engineer because it was the same angle all the time it happened,good luck, PS you English is very good
    Message was edited by: sido1

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