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

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