ASRock AB350 Pro with Ryzen 5 1600 wont post

For future reference, I highly recommend you do not run any system without a CPU cooler. While it should be possible with thermal throttling and other safety features it causes an extreme amount of heat, well beyond the operating heat the components were designed for. Heat like this can radically reduce the lifespan of effected components. Even just sitting the heatsink on top of the CPU without fastening it down is better than doing this.