Ok so I have a 2011 21.5" IMac with an i5 quad core processor at 2.5 ghz. This computer has been great so far. All of a sudden I'm getting these random screen issues. I've tried a lot of different troubleshooting processes but it still does it. Anyone have or had this kind of problem? I've got an external monitor plugged in but it's been like that for a good while with no issues. Today ill hen I booted up, it had all kinds of this randomness and wouldn't boot. I had to PRAM it. I can provide more images of needed. Anyway thank you in advance.
Very similar to this
Very similar to this
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