Wholehog2 : screens scrambled and boot failure

Hi,
At boot, my Wholehog 2 hangs like that:

zeubest.free.fr/hog2.jpg

The screens are unreadable and the boot fails even after several on/off... argh !
Today, after 10 minits, it finally worked, in normal boot.

Have you ever seen this issue and do you please know how to get rid of it ?

I'm worried ! I need this console for my work and any help would be highly appreciated.

Many thanks :)
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