Coloured lines on Hyperpixel 4 / Raspberry pi 3b+

@onitsuo wrote:

Hi there,
I’ve bought an Hyperpixel 4 for my raspberry 3b+, first installation ok, everything looks great.
Today i’ve decided to use it on another raspberry pi 3b+, new installation of “Raspbian Buster with desktop and recommended software”, i’ve followed the same installation than before but now i have horizontal lines on the screen and i can’t do anything…
The lines are moving a bit, the colours are changing but it stays like this.

Do you have an idea?

Thanks!

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