Multiple laptops black screen problems

[bobans1983]

I have three laptops
Msi i7 7th gen
Lenovo ideapad 320 amd a10 ati gpu
Asus f556u i5 nvidia gpu

Everyone has same issue
Just *blink* blackscreen than fade away
No blacklight.

Flashed bios
Reflowed gpu
No sucess



Any further information ehat to check?

Here is video of problem

Thanks in advance.

https://youtube.com/shorts/GGjafQS8bdg