Unusual red vertical lines on screen

My screen is showing vertical redlines but only on certian parts of the screen as can be seen in this screenshot
https://public.me.com/ix/daniel_pierce/screenshot1.png
Is this a hardware issue or something that can be fixed in software?
My computer is an 24" white Intel iMac(late 2006) bought March 2007.
Any advice would be appreciated.
Thanks Dan

So here's my followup on this issue:
After some research, I decided that it was worth the effort to bring it to an Apple Genius at an Apple store last Thursday. The Genius spent a few minutes looking at and felt that it was one of three things: the display, the graphics board or the cable between the display and the graphics board. The cable cost $13, the board $180 and the display was $500. Needless to say, I was hoping it was the cable. I left the iMac with them so they could work on it.
The following Saturday, I got a call from the same Apple Genius that I had talked to and he said it wasn't the cable. He mentioned that the other parts were on order and that it would be a few more days before they could fix the computer.
Yesterday, i got the call that it was fixed and ready for me to pick up. As it turned out, it was the board. So the with the cost of the board plus the flat $49 repair fee, it cost me $230 to have it repaired. Since this was the only time I had ever had an issue over the last 4 years, I felt it was a fair price to pay for keeping it working.
Funny aside: I mentioned to the Apple Genius that while they had the iMac open, could they look at the optical slot drive. It was no longer accepting discs. When I got the iMac back, taped to the front was a transflash-to-sd-flash card adapter. Obviously, either my 3 year old or 5 year old tried to load it thru the slot drive. "Fixing" the drive was covered under the flat $49 fee.

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You are still under warranty. Call Apple Care. Make sure you get a case number as all repairs have an additional 90 days of warranty.
#1 - You have 14 days from the date of purchase to return your computer with no questions asked.
#2 - You have 90 days of FREE phone tech support.
#3 - You have the standard one year Apple warranty.
#4 - If you've purchased an AppleCare Protection Plan, your warranty last for 3 years. You can obtain AppleCare anytime up to the first year of the purchase of your computer.
Take FULL advantage of your warranty. Posting on a message board should be done as a last resort and if you are out of warranty or Apple Care has expired.

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