Usb boot stuck on a Dell Optiplex 3020

It gets stuck at a line saying: AppleBusController::requestStaticServicePowerLocked: power supply unavailable, assuming successful po- (yes, it's missing info there, sometimes it displays more of the line, sometimes less). It never boots up on this PC. But out of interest, I tried it on a laptop with different specs, and it mounts the filesystems and everything, and when it tries to get to the interface, it bootloops. It shouldn't even work, the specs are completely different, but it still gets further than the Optiplex. Any help will be appreciated. !!!UPDATE: I figured out that the error came from the fricking USB 3 port being used. Now it gets stuck at calling mpo_policy_init. I don't know why.

submitted by /u/_ReDave_
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