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El Capitan hanging on boot with some USB devices


nellazzo
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Good Morning! I'm having a little trouble with some USB devices, causing several boot loops.

 

1st boot:  I turn on the trackpad during boot process, but a few seconds later, the monitor turns off.

2nd boot: I plug the webcam in, before booting, but the monitor turns off one more time.

3rd boot:  I plug the webcam out and the system boots up properly. (sometimes I have to disable graphics "nv_disable=1" in order to boot)

 

 

I don't know why some USB devices (webcam, trackpad, ext. HDD too) do prevent system from booting, and other USB don't (printer, bluetooth, UPS).

 

Thank you in advance!   

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