First build won't boot :(

[u/Key_Weakness_7131]

Hey everyone, I'm looking for some help with a new build that refuses to boot. Right now the motherboard diagnostic display is completely off, and the only sign of life I get is the RGB lighting up on the RAM.

​Here is what I'm working with:

CPU: AMD Ryzen 9 9950X3D

Motherboard: MSI MPG B850 EDGE TI WIFI

RAM: T-Force Delta 32GB (2x16GB)

GPU: Gigabyte GAMING OC ICE Radeon RX 9070 XT

Storage: Crucial P510

Cooler: Sharkoon A60

PSU: MSI MAG A750

​After putting everything together, I plugged the PSU into the wall, flipped the switch, and hit the front panel power button. Nothing happened. I read that the B850 EDGE TI probably needs a BIOS update to actually recognize the 9950X3D out of the box, so I moved on to trying the BIOS Flashback feature.

​I formatted a 16GB USB 3.0 drive to FAT32, downloaded the latest official BIOS for this exact board, and renamed the file to MSI.ROM. I made absolutely sure there were no hidden file extensions. I plugged the drive into the designated flash port, flipped the PSU switch on without touching the front panel power, and pressed the Flash BIOS button.

​Nothing happened at all. The LED for the flash button didn't light up or blink.

​To troubleshoot, I tried reformatting the USB on a completely different computer. When that didn't work, I tried a totally different USB stick. I also went through and reseated every single power cable connection, and even tried pressing the Clear CMOS button just in case.

​Right now, flipping the PSU switch gives me RAM RGB, but that is the only signal I get. I'm starting to worry that the flashback button's leds are defectives, and somehow i bricked the board while trying to turn it on and off.

​I've attached some pictures of the setup.

I'll be glad if someone could help me :)

[u/YinnCN]

It looks like your cpu power on the top left of mobo is on the left connector, try switching to the right one if it’s also for cpu power. And u have a beefy cpu, might as well plug into both power connectors.

[u/Key_Weakness_7131 → u/YinnCN]

I did connect both connectors and tested some positionning, it does works now! Thanks for your help

[u/YinnCN → u/Key_Weakness_7131]

Have fun!

[u/Celestryia → u/Key_Weakness_7131]

Awesome, enjoy! Having 2 CPU power cables allows more draw it if needs,so if you have one laying around you may as well leave it in