Had the same problem - no output to screen. Had no speaker, all fans were spinning. I knew the system behaved differently when I inserted a windows usb installation drive:
With no installation flash drive, the system just turned on the mouse and keyboard lights after a few seconds.
With the windows usb installation drive, the system turned on and then sort of shut down and then turned on again.
That way I could tell, that the CPU and motherboard must have done something together.
I used an old monitor (13 years old) and no video was output - neither by my Gigabyte B450M DS3H motherboard's HMDI or by my ASUS 1070 graphics cards HDMI. When I tried my newer monitor (bought from new a year ago) I did not get video out from the motherboard, but with the graphics card (the 1070) everything worked!
So maybe there is something with old HMDI standards and a locked HMDI port on my particular motherboard - I don't know. Just thought I would share my experience with you.