If usb is plugged the computer won't boot

Hi there. I have recently started to experience a new type of problem. I have two usb hdds connected to a usb hub. I've never had any problems with it(the hub). After I installed the last update 10.7.3 everytime I restart my computer if I have the hub (with all my hdds and other devices) connected to my computer, the computer won't boot. It get up to the white screen (before the loading wheel). If I unplug the usb cable it starts booting inmediately.
The funny thing is I didn't change anything lately. It started to do this yesterday.
Thanks

Is the hub powered? If not that is probably your problem. The hd's are sucking power but can't get enough to power up and that is probably stopping the MBP from booting.

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