Last Monday my Ryzen 9 3900x, the last piece of hardware I needed to begin assembling my new rig, was delivered. After fully assembling the rig, I pressed the power button on my case, but the rig failed to boot. At first I thought I had wired the front panel connectors incorrectly, so I tested the power button on the motherboard itself, but that failed to boot the rig too. After a few hours of troubleshooting and requesting assistance on various forums, I eventually came to the conclusion that my motherboard had been DoA. As a result of that, I had to go through the tedious process of disassembling the entire rig and requesting a replacement for the motherboard. In order to prevent that hassle again, I would like to know if it safe for me to test whether or not the rig will power on without a CPU heatsink installed. More specifically, I intend to place the motherboard into the case, plug in all of the necessary cables, place the 3900x into the CPU slot, but not install the heatsink, and then quickly press the motherboard's power button to see if the rig powers on. If the power on is successful, I would then flip the PSU switch to the off position, likely within two seconds of having pressed the power button. Is this method of testing safe to perform?