Small form factor PC video output problem

[Skyforge]

Hey all!
My friend asked me to help with his new media pc, so it's 2-3 months old and worked fine until one day it didn't. The problem is if there is a hdmi, vga etc cabel connected to it, it will freeze before the post screen, if i don't plug in any video output cabel it's booting fine. everythings seems to work fine but i can't test the processor or the mother board (i don't have any spare part to test with).
it has a10th gen i3.

[Skyforge]

https://www.ecs.com.tw/en/Product/System/SF110_H470/overview this is the form factor.

[Fasauceome]

23 minutes ago, Skyforge said:

if i don't plug in any video output cabel it's booting fine.

So, if you plug a video cable in after you let it boot, everything works fine?

[Skyforge]

16 minutes ago, Fasauceome said:

So, if you plug a video cable in after you let it boot, everything works fine?

Yes

[Fasauceome]

15 minutes ago, Skyforge said:

Yes

is this also impacted by sleep mode? If the PC goes to sleep, does the video problem occur when it wakes back up?

[Skyforge]

23 minutes ago, Fasauceome said:

is this also impacted by sleep mode? If the PC goes to sleep, does the video problem occur when it wakes back up?

i just tested it, sleep mode works fine only when booting up

Maybe bios problem?