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I would go so far as to say that 99.999999% of all issues where a new build won't boot is to just push harder on the RAM.
Been building computers for almost 3 decades now and I STILL am a little bitch when it comes to seating RAM. It is the least expensive component in the case and mobos are literally designed to let you know when you push hard enough but I still will never push hard enough (for all the sticks) on the first try.
I had similar happen to me. Put all of it together, turned it on, then panicked a little when it wouldn't boot up.
Turns out one stick of RAM was not fully slotted in, so obviously that's not OK. Was easy to spot once I double checked components. Popped it back out and in, then it was good to go.
This can be the culprit along with hundreds of others. Another common one in more powerful PCs is your power supply does not have enough juice.
An underpowered PSU will usually show issues when actually running heavier loads, not immediately at boot I think.
This isn't just for new computers. After a few hundred heat/cool cycles, the ram can become unseated enough to cause issues. Although it's definitely not as big of an issue as it was a decade or so ago.
Blowing on it helps. The humidity in your breath reinvigorates the silicon.
One time for me it was the DVD drive. ¯\_(ツ)_/¯
Reseating cards and chips is the first step every time.
And power connectors. I've re-seated a lot of loose 24pin and 8pin power cables in my life.
I bought a pre-build PC once, and it refused to boot. And you know what was missing? A fucking SATA data cable god have mercy. That's some advanced assembling. I even had to go and buy one as I hadn't a spare one at hand.
Although yeah I definitely had some screw ups with not inserting RAM sticks all the way or messing some other stuff like not connecting the video card to power supply.
Removed
Very good tip, this was also the issue on an old desktop of mine. For 3 years I thought it was just cursed until I finally removed and reinserted the RAM sticks. Now it works flawlessly!