My iMAC 27" suddenly displayed thick vertical green lines and then went to a whitish grey screen.  any insight?

While accessing PAGES on my 27" iMAC computer, then screen suddenly displayed thick green vertical lines and then went to a whitish grey screen.  Each time I shutdown and turn back on it shows the same thing and then goes to a blue screen.  The last time I rebooted and I came to this site to try to problem solve.  Any idea?

It sounds like a GPU problem, but I am not sure. Try booting in AHT (Apple Hardware Test) to be sure. Also, if you have another Apple computer, try to boot the other computer with the hard drive from the iMac using target disk mode. While booted on your imac's hard drive, check console for kernel panic logs. Paste only Kernel panic logs not application crash logs here please.

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