Display turns gray, works after a period of time
after changing my HDD to SSD my display doesn't work properly.
It first shows a gray background after turning on my iMac (some kind of gray snow, comparable to cosmic radiation you see on analog TVs) and after a period of time I can see the screen in normal mode, colorful etc.
I already tried to unplug and re-plug the inverter cables but it didn't solve my problem.
I hope you can help me.
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