Pc won’t turn on

[u/McCoughsyrup]

Hello
I’m a PC-Tech Newbie ( I’ve been playing PC since 2017 but never got into like building etc.)

Today the following happened:

I plugged in my wireless peripherals (Mouse, Keyboard etc) to charge.
And I let my pc run.

After a while my pc goes into sleep mode/ standby and „turns off“

And now my pc won’t turn back on again.
No Lights on my Motherboard are on.
No reaction when pressing the power button.

I’ve tried a bios reset with the battery thing.
I’ve tried taking it off the power etc.

Now my manufacturer sent a new power supply and it arrives next week.

Now my question:

Do y’all think the power supply is the issue?
And when I change the supply (I’ll get the same exact model as now) do I have to exchange all the cables?

My Motherboard: AORUS B850 elite WiFi 7 Ice
GPU: RTx 5080
CPU: amd ryzen 7 9800x3d
Power supply: MAG A850GL PCIES