Question Monitor doesn't show BIOS, boots directly to Windows

Nov 25, 2018
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I bought my first PC with msi b450 gaming plus mobo and ryzen 5 2400g cpu(no GPU), and it was working just fine with my TV(showing bios during boot and all).

Then i bought a AOC 24V2Q monitor, but during boot it shows "input not support" message with nothing on screen and then shows windows with no problem.

Is this an issue with minotor and i should RMA it, or can i fix this myself?