Blue lines down imac screen

I have an iMac4,1 with an Intel Core Duo processor, and on the right side of my screen I developed a blue line running from the top to bottom of my monitor. A couple months later, another line appeared right next to it. Does this mean my iMac is crashing? Can this be easily fixed?

The iMac 4,1 was made from Jan 2006 to Sep 2006 so it is five years old. At that age it's possible that a problem is developing in the on-board graphics card. The fact that it's an iMac means (1) it isn't easy to take it apart and (2) the graphics card isn't removable, it's part of the main circuit board. It may not be practical to fix it. Run the Apple Hardware Test as Carolyn suggested. Maybe it will find something less catastrophic that can be repaired inexpensively.

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