Skr 2 powering issues

Hey yall. I'm trying to power my SKR 2 through my power supply and it's showing very faint LEDs and my pi isn't getting enough power to start up RatOS (see 1st Pic)

However if I power it through the u-disk port, the LEDs are on full brightness and that's enough to get RatOS to start up (see 2nd Pic)