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Question Green LED lighting up on MotherBoard ASUS ROG STRIX B450-F, but no signal.

Jul 12, 2020
I have a Ryzen 5 2600x and a Nvidia Geforce Gt630 . My motherboard is an ASUS ROG STRIX B450-F.
It has been working well for a month and today I put the pc to sleep. I try to turn it on but no signal on my monitor.
I look inside the case and a green led on my mobo is lighting up. I jumped the CMOS, changed RAM, buy a new source of power, changed thermals on CPU. Nothing else works.
Anyone can give me a help for this? It’s my first time building a pc.
Everything is powering up including CPU and case fans. Keyboard and mouse are fine, GPU fans as well, just no signal.