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But even if your memory works properly, the initial DDR4 training cycle can take a very long time, especially after a cold boot (or a failed overclock). On all the boards we've tested, we've seen the memory training and POST process take anywhere from 30-60 seconds, sometimes with a couple of clear restarts in between.
Imagine that for a moment: your PC can boot to the Windows desktop in less than ten seconds, but just getting to the boot process in the first place might take over a minute. And for an enthusiast looking to finetune performance, almost every time you restart the PC you can expect an extra 10-15 second delay—that's in addition to the more typical 15-20 second POST times. On most motherboards, a cold boot takes at least 40 seconds to complete the DDR4 training and POST, sometimes 75 seconds.