My Mac Mini only initialises if I unplug the USB hub

My Mac Mini will was not booting was remaining with a white screen. I discovered that it only completes the boot if I unplug a USB hub that I use. But it was working fine with this same hub connected and this syntom began after I turned it off and disconected all the cables to clean the computer and my desk. When I turned it back on, nothing happened... only a white screen...

I unplugged all devices from the hub, but it didn't solved the problem, so I think maybe the hub is the culprit.
The strange thing is that it was working fine till today. After I unplugged everything from my Mac Mini and then plugged everything again, the problem started.

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