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[SOLVED] Freshly built PC, fans spin but won't connect to monitor

Jul 20, 2019
Just finished building and testing my newly built PC. I turn it on and the fans spin to life, but after twenty or so seconds they both stop, then spin back to life again for another 20 seconds...

When I plug into a keyboard, the power light turns on for a few seconds but none of the fancy LEDs or the capslock light work. When I plug into a monitor nothing happens, even as I tap "del" continuously.

Please help, I'm a bit baffled and not sure what's wrong as each piece works on its own. I've already tried replugging and checking the PSU cables.