Sudden boot failure

i’m using manjaro gnome more than a week ago
dual boot with windows 10
it was working fine every thing was normal all the week.
last night i finished and turned off manjaro normally
this morning i tried to turn on and found that problem monitor turned off giving me a message " no signal " but the pc still running and cpu fan rotating

this is on manjaro only .as on this video

https://www.youtube.com/watch?v=OUXkC7KWptc

wnidows10 still working fine and i’m writing this topic from it

my GPU is AMD Radeon 7450
CPU AMD fx4300 quad core 3.8Ghz
RAM 8 GB DDR3