I have 4 vertical stripes across the entire height of my monitor. Do I have to buy a new imac? e

I have 4 vertical stripes across the entire height of my monitor, the stripes are there even before I log on. My 17" imac is 6 years old. Do I have to buy a new computer?

Frequent problem on 2006 17" imac!
Most of the time, it's a defective LCD panel.
To validate if it is the LCD panel or the graphic card, you can take a screen shot (cmd+Shift+3) and see if the problem is visible on the screen shot.
If it is not visible, then it's most likely the LCD panel.
This can be confirmed by connecting an external display to your iMac.
If it works well, then it's the LCD panel that is defective.
Does it look like this?

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