hello my russian friends

i have a laptop here that its true everywhere,except gpu works
when i run gpu stress test(furmark) it turnes off instantly

i try different windows and drivers
i change cpu,ram,bios
i replace vga chip

but nothing changed

what else can cause this problem?

tnx for ur help

What temperature of vga chip during the test?
And I think, it is worth looking at vga chip power.

temperature is normal
about 60 degree

it never run the test even for a sec
when i click to run,it turns off!