Newly built PC won't start, please help? :)

So I just built my new PC:
Ryzen 5 3600
MSI Rx 5700
Asrock b450m Steel Legend
Corsair Vengeance 2x8gb

Anyways, I got it nicely built, plug it in and turn on the PSU. The lights come on on the motherboard, but the power switch does absolutely nothing, no fans turning, nothing!
I also tried shorting the power button pins on the mobo, but got the same result.

I've tried unplugging everything and plugging them back in (except GPU and CPU), and I've tried different combinations of the two RAM sticks, but no result.

The motherboard needs the right BIOS version for the CPU, but the box came with a "Ryzen 3000 ready" sticker on it, so that should be fine. But I'm wondering if perhaps the BIOS might not have been updated? Would this cause the PC to not even attempt to turn on?

Please help, I'm open to any suggestions!

Thanks Happy

Edit: I have tried stripping it back to just PSU, mobo, CPU and heatsink, again with no luck.

I have also tried using a spare PSU and both PSUs passed the paperclip test.

I have also tried clearing the CMOS.

Post was last edited on September 7, 2019 4:55 AM PDT

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Did you start as small as possible?

We don't need RAM, case, GPU and what else to just power up.

How small did you make it?

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I have now

I've tried down to PSU, mobo, CPU and heatsink with and without a stick of RAM and still no luck.

I've also tried using a spare PSU, but my PSU passed the "paperclip test" anyways.

So I'm guessing it must either be the mobo or the CPU. Is incompatible BIOS enough to stop even the fans from spinning when trying to start up? Surely not?

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