We don't need RAM, case, GPU and what else to just power up.
How small did you make it?
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!
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.