Tecra M11-17V with Windows 7 - Web Cam image is very grainy

Hi,
Yesterday my webcam (built into the laptop) worked perfectly, today it doesn't....
Whenever I use it now, the image is very grainy, almost like a tartan pattern of criss-crossing lines, but I can still just about make out myself in the background. Movement and sound are still being recorded, just the image is strange.
Please help! Has anyone else had this happen? Is this something I can fix myself, or is it a hardware problem? I have had this laptop about 3months, from brand new, and this is the first problem I've had...
Many thanks,
Dom

Hi Paolo,
Thanks for the tips, but I'm afraid my camera is still out of action....
I've double checked that the protective lens film has been removed, and I've disabled/re-enabled the camera device, updated the camera driver, and completely reinstalled all the camera software to no effect. I've also ruled out conflicting software issues, as the problem persists for both skype calls and the laptop's face recognition software used when logging into my account.
The frustrating thing is that the fault happened suddenly halfway through a skype call. It was working perfectly on minute, and broken the next (seemingly irreversible.... fingers crossed). I had used skype for a mammoth 3hr call the night before, but I hope that wouldn't have "burnt out" the brand new camera...
Do you, or anyone else, know if sounds like a physical problem? Are web cam hardware faults common? I have never dropped the laptop, though it does commute with me on the train into work everyday...
When I first got the laptop, the inbuilt fingerprint scanner didn't work very accurately until I updated the driver software. Is it common for faults to suddenly appear when drivers become "out of date"? Any chance these problems could be related?
Thanks again for your help,
Dom

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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        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