I had an issue like that on this computer when it was time to upgrade the video card. I have a gigabyte motherboard
What it would do is show the windows logo during bootup then go to a black screen, screen would flash the led light on it like there was no video signal.
First was It would consider the new video card as a second display device. When you turn on the computer, it would default to the onboard video, and the new card was showing up as monitor number 2 which would get a black screen due to there not actually being a second monitor so it would actually be disabled. I ended up using a VGA switch and having the output from both the onboard and new card to go to the monitor, and switch them back and forth until I got the settings right so it would work correctly on the new card.
It was a major PITA but it works fine now
So if you have onboard video plug a monitor into that and see if the video is coming up on that instead of the new card