“Monitors Problem”

My PC are in Good Condition Since Last Two months but after a weeks it start to crash, the problem is there are no display on my monitor, the LED on my monitors are all blinking, I’ll try to swap another monitor to my box and it work to that PCbut when i try to use again my old monitor it didn’t work as well.
Is there any problem regarding on the compatibility of the devices or any corruption on files?
Than’x