Question My newly upgraded PC is not turning on.

[TheRealPotatoes]

I recently upgraded my motherboard and CPU and switched from an Intel processor to a Ryzen 5 1600 and because of this needed a new motherboard (ASRock B450M Pro4). After installing the new components in my PC in what I assumed was the correct way my PC won’t turn on. I have tested the power cable and supply as well as reset the CMOS and I know my PC is receiving power because the light around the power button is on when I plug it in. The fans are not spinning and when I press the power button it doesn’t turn on.

Specs:
AMD Ryzen 5 1600
ASRock B450M Pro4
2 x 4GB Corsair Vengence DDR4
Gigabyte GTX 1050 2GB VDDR5
Seagate Barracuda 1 TB HDD
And an unbranded PSU from an older build which did work with the older components.

Any help is appreciated, thank you.

 

[mdd1963]

Ensure the ATX12V CPU power is connected to mainboard...

Disconnect all unneeded SATA power cables/data cables, RGB fans, etc., even front panel USB headers from mainboard...

Retest with only 1 stick of RAM in required/recommended first slot....

All you need is:

24 pin ATX power connected from PSU to mainboard
"PWR SW" two-pin header from case to mainboard
1 RAM stick in recommended slot (test each alternately)
GPU installed/connected (with external PCI-e cable from PSU if connector present on top of GPU, I think many or some 1050's might not need supplemental power?) (YOu can even test with no GPU installed, it's possible the MB would give a beep code for no display adapater, etc., as there is no fucntikonal onboard video with an R5-1600 installed
CPU fan connected to 'CPU FAN' header on mainboard...