I recently recalled this m1296 which has bad vertical collapse. On first run it looks fine as in the picture. I went into the monitors panel and hit identify monitor and it’s coming up built in monitor. Then I did a soft reboot. Now I’m getting this:
So thinking I may have borked the resolution settings. I disconnected the hd and did a pram reset. Now it’s just solid lines and distortion. I checked all the voltages (don’t really think it matters) and they’re all there. Maybe a little high in the 24 and 100 but within 10%. I’m out of ideas.