Computer trouble! HELP :(

Hey everyone, I just finished building my second PC and I've run into a bit of a snag...
So, here’s the deal. When I plug everything in, nothing happens. There's no power LED lighting up or anything to show it's getting juice... absolutely nothing. Then, when I hit the power button a few times, it tries to kick on, but then it just shuts itself right back down after maybe two or three seconds. That's it. If anyone has any idea what might be causing this, please let me know! Thanks! 🙂

To start with, maybe try swapping in a different power supply...

If this is a brand-new build, I’d suggest sitting down with the motherboard manual and following the assembly steps strictly in order. It’s easy to overlook something small, like forgetting to plug in the 12V CPU power cable or something similar. Since you haven't provided much detail beyond a few basic points, there isn't much anyone can do to help you troubleshoot just yet. Is this your very first time putting a computer together, or are you working with some older components you already had on hand?

I tried swapping in a different power supply, but I'm still hitting the same wall... honestly, I'm starting to think the motherboard is the culprit, but I wanted to see if anyone else had any thoughts before I give up on it...

Just disconnect those front panel cables coming from your case—you can just grab a screwdriver or a wrench if you need to—and then bridge the positive and negative pins on the motherboard's power header. See what happens after that... Just make sure you've actually got the 24-pin power connector and the CPU power cable plugged firmly into the motherboard first, obviously.

I've already given that a shot, but I'm still getting the same result. It starts up for about two seconds and then just dies...

Since you already swapped in a different power supply to test it, then it’s pretty much a certainty that the motherboard finally gave up the ghost..

It’s possible one of your components has finally given up the ghost. Have you tried booting the system without the GPU or the hard drive attached? I'd suggest reseating the RAM in different slots, or better yet, borrow a stick from someone else to test it out if you can. What exactly are we working with here—do you have integrated graphics available?

So, I asked my brother if I could borrow his motherboard just to test things out, and everything worked perfectly. Now I know I definitely need to buy one myself... but before I pull the trigger, I wanted to get your take: what do you guys think about this board?
Here’s the link:
Is this one actually more powerful than the: MSI MAG B550 Tomahawk?

Listen, buddy... those two motherboards actually use different sockets.
Do you happen to have one of these processors on hand?
https://www.dell.com/Motherboards/AM1MA/HelpDesk_CPU/

What kind of processor are you actually running right now? 😬 That Dell motherboard you linked is definitely a step up, but there’s a catch—it requires DDR3 RAM. So, you'd have to factor in the cost of buying that too 😁 Plus, you'll need a brand new CPU since it uses a completely different socket...

What kind of CPU and RAM are you running? You might want to look into this instead: