Question Asrock z390 power on issue

Feb 24, 2019
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So I was using my computer yesterday when it abruptly shut off. Nothing strenuous, I don't think there is a thermal issue. Since then I have not been able to get the thing to power on. Tried removing from the case, removing GPU, SSD, swapping RAM around, all without success. Motherboard and CPU power are connected, and CPU fan cable is connected. My PSU appears to be working, because there are a three LEDs on the motherboard which flash when power is connected. I haven't been able to find any information on possible debug info encoded in those LEDS. I have a pc speaker on order to see if there are any debug beeps. Any troubleshooting suggestions or help would be greatly appreciated!

Here are my components
ASRock Z390 PHANTOM GAMING-ITX/AC LGA 1151
i5-9600k
Team T-Force Vulcan 16GB (2 x 8GB) 288-Pin DDR4
Zotac GeForce GTX 1070
SSD