Webcam has a green line through it.

I regularly use Facetime and Skype and use my webcam but I have noticed thin green lines appear in the same place when I view the camera image, what happening?
Here are the specs on my mac if they make any difference
And here is a screen shot of what the green lines look like (I put a piece of paper behind it so you can see them and put red rings so you know where to look)
It doesn't make a huge difference but I would like to know if there is a way to get rid of them because I have onlt had the iMac for a few months and they have already appeared.
Thanks, James.

Okay, thanks for the help, much appreciated, I will look into it, might call up apple to see if they have had any other complaints about it and if they can do anything about it. It isn't too much of a problem at the moment as my video quality isn't high enough for other people to actually notice just worried about it getting worse in the future.
Thanks for the hep though

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1. Back up your iPhoto Library - you should always have a back up anyway.
Most Simple Back Up
Drag the iPhoto Library from your Pictures Folder to another Disk. This will make a copy on that disk.
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Use an app that will do incremental back ups. This is a very good way to work. The first time you run the back up the app will make a complete copy of the Library. Thereafter it will update the back up with the changes you have made. That makes subsequent back ups much faster. Many of these apps also have scheduling capabilities: So set it up and it will do the back up automatically. Examples of such apps: Chronosync or DejaVu . But are many others. Search on MacUpdate
2. Reinstall
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1. Put the iPhoto.app in the trash (Drag it from your Applications Folder to the trash)
2a: On 10.5: Go to HD/Library/Receipts and remove any pkg file there with iPhoto in the name.
2b: On 10.6: Those receipts may be found as follows: In the Finder use the Go menu and select Go To Folder. In the resulting window type
/var/db/receipts/
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If you purchased an iLife Disk, then iPhoto is on it.
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Webcam has a green line through it.

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