I have a blue veritcal line going down the middle of my screen turned my iMac and it showed up. What can that mean?

I have a blue veritcal line going down the middle of my screen turned my iMac and it showed up. What can that mean?

Hard to help without knowing which variant of iMac you have. They've been in continuous production since 1998 in four major families, and what works for one familiy of iMac may not work to diagnose one from another family.
Doing "About ths Mac" will show the processor info. Post what it says about your processor (and Mac OS version while you are there) and that will narrow what family of iMac you have.
This forum section is for the three iMac families made before 2006.

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