I recently helped a neighbor build out a custom gaming PC. After putting it all together, it initially wouldn't even power up. Chalk up a bad power supply for that. Once replaced though, the computer still wasn't showing anything on the display, despite all of the components hooked up and getting power. All of the debug LED lights on the motherboard were coming on and going out as expected.
So I finally used a jumper to clear the CMOS and that fixed it. The boot screen came up as expected.
I should note that one thing that initially threw me for a loop was that this particular motherboard—and many motherboards these days—do not have onboard graphics. So despite having video out connectors on the motherboard, you need a graphics card installed in order to get any video signal at all. At one point I had pulled all of the cards out of the case to try to isolate the problem.
Once I got Windows 10 installed, I had another problem with the WiFi card. Despite installing the latest drivers, it was not showing up at all in the Device Manager. I had to flash update the BIOS and also change the PCIe bus from 16x to 4x-4x-4x-4x. Hope this helps someone else.
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