PC died, need help with diagnostics.

Hi, I build my latest PC roughly one Year ago.

It died 15 minutes ago. I was playing at the time.

It shut down spontaneously, refusing to turn back on. It made the noise my psu usually makes at regular shutdown (a slight click). Now not a single diagnostics LED on the motherboard is lit up when I turn the psu on. It looks completely dead.

Where do i start looking for what failed?

I don't have a second system I can check anything on.

Is my best move just to hire a computer repair shop? Or order a new psu?

System Specs:

AMD Ryzen 7 9800x3d

MSI MAG X670E TOMAHAWK WIFI

64 GB RAM

RTX 5070ti

Be quiet 1000w PSU (Dark power 13)

Be quiet AIO

2 ×NVME SSD

Thank you for your help!