System won’t boot - error code 40

[Ironic Namesake]

Hi,

just wondering if anyone knows what this issue might be.

Had a power cut last night, so shut down PC (shutdown and apply updates) as it’s on a UPS and since then it won’t boot.

First try was throwing error message about USB over current , after unplugging all USB devices the LED stays on 40 (which apparently means waking from S4 sleep state)

Board is a MSI X370 Titanium, 3950X and 5700 XT.

So far I’ve only powered on / off a few times and all displays (it’s a 6 screen setup) are blank.

 

[Ironic Namesake]

Ok managed to get it to boot after resetting the BIOS.

Not been able to figure out which USB device is causing this issue though, leave that for another time. The setup is a mess as there’s a bunch of USB extensions that go behind the desk and feed into each monitor, and some direct to devices.