To double check, I flash back to recovery ROM (for the 10th time give or take), and this time it worked?!
I don't know what I did differently or whether you have magic powers, but thanks nonetheless !
Thank you so much tihsamikah, you pointed me to the right direction.
Check my video here : https://youtu.be/geVQZxHYTXM
The ribbon cable seems to be the source of our problem.
**edit: in fact, it's what you meant by 'pushing the DLP black cable in a bit further'**
As you told : The box is too tight when the projector is closed.
When the box is closed, the ribbon cable get compressed
The video I took is from a cold start (after not using it during 2 days).
Previously I had to wait at least 2 minutes before seeing any display.
Now, I have to find a way to avoid the case touching this cable.
As you told : keeping the case not fully closed should do the trick.
For those who need it, opening the case is identical than on the video posted by wire_less :
The differences are :
-There is no screw behing the sticker on the back (SKU sticker).
-There is no screw at the center of the card on the back (the card with the hdmi slots)
-There are yellow warranty stickers on the sides of the card with the hdmi slots, theses stickers are hiding screws.
Please note that the side of the case where the power cable go is difficult to open, use a credit card or a mediator to unclip all the small plastic hooks.
*EDIT: There are some grooves lines inside the top case cover,
theses lines was pressing on the ribbon cable and the metal plate (farraday cage on the top right).
On the 2 last photos, I can see the horizontal lines marks made from the upper case design compressing the metal cage and the dlp ribbon cable.
Using sand paper to remove those lines inside the plastic cover can maybe avoid the case compressing too much the hardware.*
*EDIT2: Did a cold boot without the metal plate while projector was closed: it's not solving the problem (long boot time).
Back part of the projector was loosened, but front part was fully closed. will try to loosen the front part too in some hours.*
Now, it's fixed for me too. \O/
I removed the side of the rubber sticked on the top of the DLP (the part under the red square of my 1st pic).
Then, I sticked it back but less tighten (so the black ribbon cable is more free).
In order to be sure that the projector top case will not touch the ribbon cable when it's closed :
I sticked 2~3mm of 3M Coated Tissue Tape on the top of this rubber (still on the DLP side).
I closed the projector case (just clipsed, no screw), started the projector and got no problem (fast display on a cold boot).
The only screws I put back are the ones at the back side of the projector (to maintain the card with the hdmi ports).
So my problem was not only the cover touching the black DLP ribbon cable, but also the grey rubber tape tightening it too strongly.
And the front part can't be tightly closed or late display on a cold boot appears again.
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