Three suggestions off the top of my head.
Did you get one of those little speakers that plug into the motherboard and, if so, did you fit it? Some motherboards emit various patterns of beeps as error messages which might tell you something. Trouble is, one motherboard I bought had the connector for the speaker, but no speaker. Fortunately, I had saved one from an old defunct m'board.
This might sound a daft question, but I've done this myself.
Is that a PCIe card or onboard video? And if an add-in card, did you connect to the onboard video by mistake?
As far as the keyboard is concerned, some motherboards come with USB-keyboards disabled by default in the BIOS and you have to use a PS2 keyboard to configure the BIOS. Was that a USB keyboard? Of course, you have to have working video to see the BIOS screen...
Edit: Suggestion 4. I've had a situation where the allegedly matched-pair of RAM sticks didn't like each other - or it may have been a m'board issue. I could boot up with either one of the sticks, but when I fitted both nothing would happen. No video. Nothing. Just spinning fans. Try just one RAM stick.
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